easy science experiment for 4th graders

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78 Exciting 4th Grade Science Projects and Experiments

Did you know you can make plastic from milk?

Nothing gets kids more excited for science than hands-on experiments! Watch your 4th grade science students’ eyes light up when they try some of these activities. You’ll find physics, biology, engineering, chemistry, and more. These projects are easy to set up and really help drive the learning home. Get ready for some science fun!

To help you find the right 4th grade science projects and activities, we’ve rated them all based on difficulty and materials:

Difficulty:

• Easy: Low or no-prep experiments you can do pretty much any time
• Medium: These take a little more setup or a longer time to complete
• Advanced: Experiments like these take a fairly big commitment of time or effort
• Basic: Simple items you probably already have around the house
• Medium: Items that you might not already have but are easy to get your hands on
• Advanced: These require specialized or more expensive supplies to complete

4th Grade Science Fair Projects

4th grade stem challenge science projects, 4th grade motion and energy science activities.

• More 4th Grade Science Projects and Experiments

These 4th grade science experiments also work well as science fair projects. Try changing up the variables to turn it into a real experiment, then form a hypothesis and find out what happens.

1. Blow unpoppable bubbles

Difficulty: Easy / Materials: Medium

A soap bubble you can hold in your hand? It’s true! A little glycerin makes the soap bubble layers stronger, so you can even toss them gently from person to person.

Learn more: Unpoppable Bubbles Experiment

2. Grow crystal names

No list of 4th grade science projects would be complete without crystals! Kids of all ages love growing crystals, making this an ideal way to learn about supersaturated solutions. The classic experiment gets a new twist when you have kids shape pipe cleaners into their own names first.

Learn more: Crystal Letters

3. Grow bacteria in petri dishes

Difficulty: Medium / Materials: Medium

Your students will truly feel like scientists when they perform this classic experiment. They’ll prep the dishes with agar, swab different surfaces, and see what bacteria they grow. It’s gross science, but it’s also easy and impressive.

4. See coastal erosion in action

Here’s a cool experiment to include in your unit on oceans. Build a miniature coastline, then see how wave action erodes the shore.

Learn more: Erosion Experiment

5. Erupt a lemon volcano

Difficulty: Easy / Materials: Basic

Early chemistry experiments with acids and bases are always a lot of fun. This one uses the natural acids of lemon juice and adds a little food coloring to up the wow factor.

Learn more: Lemon Volcano

6. Sink and float to explore density

Adding items like salt or sugar to water changes its density, as does the temperature itself. Turn this into a 4th grade science fair project by experimenting with different solutions and forming hypotheses about the results.

Learn more: Saltwater Density

7. Discover a density rainbow

Difficulty: Medium / Materials: Basic

Colorful, simple, and impressive: It’s the trifecta of 4th grade science experiments! Wow your students by layering colored sugar water as you learn about density, adhesion, and cohesion.

8. Transform milk into plastic

Plastic seems incredibly modern, but people have been making casein plastic from milk for centuries. In this 4th grade science project, students experiment to create the formula for the best milk plastic. They’ll be amazed at the results!

9. Simulate an earthquake

The ground under our feet may feel solid, but an earthquake changes that pretty quickly. Use Jell-O to simulate the Earth’s crust, then see if you can build an earthquake-proof structure for a practical and fascinating 4th grade science fair project.

Learn more: Earthquake Simulation

10. Test Sharpie solubility

Find out if Sharpie markers are really permanent with this 4th grade science project that uses the scientific method to explore solutes and solvents.

Learn more: Sharpie Solubility

11. Find out if mood rings really work

Watch this video with your students first. Then, apply the rigors of the scientific method to mood rings ! Find out what makes mood rings change color, then see if they really reflect a person’s mood.

12. Create a new plant or animal

Kids will really get into this project, indulging their creativity as they invent a plant or animal that’s never been seen before. They’ll need to be able to explain the biology behind it all, though, making this an in-depth project you can tailor to any class.

Learn more: Create an Animal & Create a Plant

13. Investigate decomposition

Yup, it’s gross … so kids will love it! Seal food items in a plastic bag and experiment to see what factors affect their decomposition, helped along by a heaping dose of mold.

Learn more: Decomposition

14. Assemble a lung model

With just a few supplies including balloons and a plastic bottle, you can make an impressive working model of human lungs. This makes a very cool 4th grade science fair project.

15. Explore the causes of tooth decay

They hear it from their parents all the time, but this experiment will prove to your students once and for all what can happen to their teeth when exposed to different drinks such as soda and milk. This is one of those classic 4th grade science fair projects every kid should try.

16. Test out different slime recipes

All kids love to make slime, so why not try out different recipes as a fun science fair project?

Learn more: How To Make Slime (4 Recipes + Printable Reflection Sheet)

17. Determine the iron content of cereal

This is such a simple (and fun) 4th grade science fair project. Select three different cereals, put them in three separate bowls, and then crush them into a dust. Then use a large magnet to determine if any of the cereals are magnetic. The most magnetic contains the most iron! Be sure to hypothesize which one has the most iron before starting so you can test it.

Learn more: Iron in Cereal Science Fair Project

18. Test out artificial fruit ripening

This 4th grade science fair project is easy enough to reproduce and the results may surprise you. Try out different methods of ripening fruit and hypothesize which will cause the quickest ripening.

19. Compare a DIY thermos with a store-bought one

Make a homemade thermos using a glass bottle, a plastic water bottle, aluminum foil, and tape. Then test out how it compares to a stainless-steel thermos at keeping water hot over several hours. Record your observations about the conditions of the bottle and the temperature of the water.

20. Test drying times for oil paints

This video isn’t specific to a science fair project, but it does briefly explain why certain pigments affect drying times. Start with a number of different oil paint colors and record what ingredients have gone into the different pigments. Next, hypothesize which will dry quickest to slowest and why. Finally, test your theory!

21. Discover ants’ dining preferences

This is such a fun science fair project, but be forewarned if you’re squeamish around bugs! Gather different forms of sugars and sweeteners and then lay them out near an ant pile. Record what you think will happen and then check back in and see how it compares to what actually happened!

22. Test music on plant growth

This 4th grade science fair project is a fun twist on growing plants under varying conditions. Be sure to be consistent with how loud and how often you play the music for one of the groups. You’ll also want to take photos each day and have someone who’s tech savvy create a time-lapse video.

23. Solar oven science project

A solar oven, also known as a solar cooker, utilizes the energy from sunlight to cook food. It works on the principle of converting solar radiation into heat energy. So how does it operate? Solar ovens are typically designed with reflective surfaces, such as mirrors or aluminum foil, which help to concentrate sunlight onto a central cooking area. These surfaces trap and focus sunlight, increasing the intensity of heat and cooking the items inside.

Try it: Solar Oven Science Project (Guide + Printable Reflection Sheet)

For students who love to tinker, STEM challenges can spark incredible 4th grade science fair projects. Here are some of our favorites for this age group.

24. Catch a dinosaur

Divide kids into groups and provide them each with a dinosaur, some large Popsicle sticks, and a bunch of binder clips. See who can build the best cage for their dino in a predetermined amount of time.

25. Make a wind anemometer

This is a relatively simple 4th grade science experiment that kids can complete to test how fast the wind is blowing.

26. Create a kaleidoscope

Kaleidoscopes produce mesmerizing whirls of colors and shapes, but they can also teach valuable lessons. Kids will learn about reflection and refraction and maybe even a bit about geometry.

27. Create an optical illusion

This is a simple way to teach students about optical illusions. First, challenge them to build a triangle out of LEGO bricks, and then see if they can make something that just looks like a triangle. Be sure to take photos to demonstrate how at just the right angle, they can trick even themselves!

28. Make a harmonica

Turn an engineering lesson into a musical one! Create homemade harmonicas using everyday materials to learn about sound vibrations and pitch.

29. Feel the force

If you have fans of Star Wars in your class, they will love this STEM project. All you’ll need is an LED, coin battery, a straw, and some tape. We can’t think of a better way to teach about circuits than by creating your own mini lightsaber!

30. Engineer a drinking-straw roller coaster

STEM challenges are always a hit with kids. We love this one, which only requires basic supplies like drinking straws.

31. Make a wigglebot

Who knew electricity could be so adorable? Explore the science behind batteries and motors by creating a simple “wigglebot.” Experiment with weights to throw the motor off balance and create fun designs.

Learn more: Homemade Wigglebot

32. Construct a working flashlight

You’ll only need a few supplies to guide your students in building their own LED flashlights. They’ll learn how electricity travels and the way circuits work. The slideshow available through the link makes this lesson a breeze for teachers too.

Learn more: DIY Flashlight

33. Build a hovercraft

It’s not exactly the same model the military uses, but this simple hovercraft is a lot easier to build. An old CD and a balloon help demonstrate air pressure and friction in this fun 4th grade science experiment.

34. Create a smartphone projector

No projector in your classroom yet? No problem! Have your students help you construct one for your smartphone using a cardboard box and large magnifying glass . They’ll learn about convex lenses and how the brain processes images too.

Learn more: DIY Smartphone Projector

35. Set up a pulley system

The science of machines never fails to fascinate kids. In this experiment, they’ll design their own pulley system to make it easier to lift an object.

Learn more: DIY Pulley

36. Design a working elevator

Engineering activities make for amazing hands-on learning. Challenge your 4th grade students to build an elevator that can safely lift a certain amount of weight.

37. Make a model seismometer

Explore the science of seismology and learn how scientists study earthquakes and their effects. This model seismometer is easy to build and fun to experiment with.

Learn more: Model Seismometer

38. Conduct an egg drop

Here’s one more classic to add to our list of 4th grade science experiments: the egg drop! The great thing about this project is that kids can do it at any age, with different materials and heights to mix it up. Hit the link below to get an egg drop project designed just for 4th graders.

Learn more: Egg Drop Challenge Ideas (Guide + Printable Reflection Sheet)

39. Demonstrate Newton’s laws of motion with balloon rockets

Who doesn’t love balloon rockets?! Your students will have a blast(off) displaying Newton’s third law of motion while learning about physics.

40. Baking soda volcano experiment

This experiment teaches kids about simple chemical reactions and physical properties. The best part? It’s easy to do and uses only a few basic ingredients.

Learn more: Baking Soda Volcano Experiment (Guide + Printable Reflection Sheet)

41. Elephant toothpaste explosion

This experiment works through a chemical reaction that results from a catalyst (potassium iodide, aka yeast) being introduced into a mixture of hydrogen peroxide and dish soap. The hydrogen peroxide is decomposed into water and oxygen and the catalyst speeds up the reaction, forcing the oxygen into the soap bubbles. The resulting effect is the substance quickly pouring up and out of the container.

Try it: Elephant Toothpaste Experiment (Guide + Printable Reflection Sheet)

Many 4th grade science standards include units on energy and motion. These energy science activities offer cool hands-on ways to spice up your classroom lessons.

42. Flick marbles to learn the transfer of energy

This experiment is a bit of a thinker: What will happen when one moving marble hits several stationary marbles sitting in a row? Flick the first marble and find out!

Learn more: Marble Energy Transfer

43. See energy transfer in action with sports balls

Place a tennis ball on top of a basketball and bounce them together to see how energy transfers from one object to another. This one is very easy, and kids will love seeing how high they can get the balls to bounce!

44. Go an on energy scavenger hunt

Emphasize the fact that energy is all around us in one form or another with this easy, free printable energy science activity. For a more advanced version, help students identify each kind of energy (kinetic, stored, heat, etc.) they find.

Learn more: Energy Scavenger Hunt

45. See a heat-powered windmill demonstrate convection

Heat rises, and its interaction with cooler air creates convection currents. Find out how we can put convection to work for us with this 4th grade science craft project.

46. Capture waves in a bottle

Here’s a quick and easy way to show wave action in a no-mess way. You don’t need to add a little ship to the bottle, but it does make it more fun!

Learn more: Waves in a Bottle

47. Assemble a wave machine

Turn this one into a class cooperative activity, or try it as a science fair project idea. Either way, it’s an incredibly fascinating way to demonstrate the energy science of waves.

48. Use a Slinky to demonstrate types of waves

A Slinky is more than just a toy—it’s also a terrific science manipulative! Use it to see waves in motion, both longitudinal and transverse.

49. Watch gravity beads prove Newton’s laws

You’ll need a loooooooong string of beads for this experiment. Make your own by taping dollar-store strings together, or buy a long bead garland . Pile them in a cup and get the beads going; it’s fascinating to watch inertia and gravity at work.

Learn more: Gravity Beads Experiment

50. Spin marble tops to learn about inertia

Glue together marbles in a variety of pyramidal patterns to form tops, then form hypotheses about which will spin best. Afterwards, kids will have fun new toys to play with!

Learn more: Marble Tops

51. Visualize the second law of motion with soda cans

Newton’s second law, concerning acceleration, force, and mass, can be a little hard to understand. This easy 4th grade science demo makes it easier to visualize.

52. Demonstrate a tornado

Create a tornado using just a few magnets and a cup of water. It’s not just cool either, as it teaches a valuable lesson on centripetal force.

53. Create a magnet-powered car

This project can be done at home or as part of a group in class. You’ll need to purchase some supplies including wheels, dowels, and magnets. It’s a great lesson on propulsion.

54. Experiment with a zip line

Provide your students with Popsicle sticks, elastics, paper clips, and more to see if they can build the fastest zip-line racer in the class. This is sure to be a hit with 4th graders!

More 4th Grade Science Projects and Activities

Use these cool science experiments to encourage a love of science, at home or in the classroom!

55. Measure a magnet’s attraction force

Fourth grade science students already know that magnets attract metal objects. In this experiment, they’ll measure to see how close a magnet needs to be to an object for the attraction to work. Mix things up with different sizes of magnets and objects of various weights.

Learn more: Magnet Measurements

56. See light refraction in action

This seems more like a magic trick, but we promise it’s science! Make colors seem to appear and disappear, change numbers into letters, and more.

Learn more: Light Refraction

57. “Draw” on water with dry-erase marker

This is another one of those mind-blowing science demos that kids will want to try over and over again. Draw on a shallow bowl or plate with dry-erase markers , then slowly add water. The marker (which is insoluble in water) will float to the top!

58. Paint with sunscreen

Prove that sunscreen really does provide protection from harmful UV rays. Turn this into a full-blown experiment by trying different SPFs or comparing it to other creams or lotions without SPF.

Learn more: Sunscreen Painting

59. Become human sundials

Choose a sunny day and grab some sidewalk chalk—your students are about to become sundials! They’ll practice measuring skills and learn about the movement of the sun across the sky.

Learn more: Human Sundial

60. Mine for chocolate chips

If you’re learning about mineral resources, this quick hands-on activity is an interesting way to explore the effects of mining. Kids have two minutes to find as many chocolate chips as they can in a cookie. Will they smash it up and destroy it entirely? Pick them out one by one? This experiment can lead to intriguing discussions.

Learn more: Mining for Chocolate Chips

61. Assemble an edible DNA model

Use licorice sticks, four different-colored candies or fruits, and toothpicks to build an edible strand of DNA. Learn about chemical bonds and the helix shape, then eat your creation!

Learn more: Edible DNA Model

62. Layer an edible soil model

Digging in the dirt is fun, but it’s even more fun when you can eat the dirt when you’re finished! Create edible soil-layer models, complete with gummy worms, for a simple earth science project. ( Find more edible science projects here. )

Learn more: Edible Soil Layers

63. Turn a penny green

Experiment with simple chemical reactions as you turn pennies green using vinegar. (Don’t forget to tell students that the Statue of Liberty is green for this very same reason!)

Learn more: Penny Reactions

64. Use marshmallows to explore Boyle’s law

Seeing Boyle’s law (which relates pressure and volume of gasses) in action makes it a little easier to understand and remember. This simple 4th grade science experiment uses marshmallows to make a great visual.

Learn more: Boyle’s Law

65. Form ocean currents

Learning about oceanography? Demonstrate how ocean currents form using warm and cold water (and a few plastic sea creatures for extra fun!).

Learn more: Ocean Currents

66. Understand the impact of non-renewable resources

This is a neat Earth Day activity . Discuss the differences between renewable and non-renewable resources, then have your class form “companies” to “mine” non-renewable resources. As they compete, they’ll see how quickly the resources are used. It’s a great tie-in to energy conservation discussions.

Learn more: Non-Renewable Resources

67. Explore blood components

Use simple kitchen supplies and candy to create a jar full of “blood” that includes plasma, platelets, red blood cells, and white blood cells. (You can even snack on the blood cells along the way!)

Learn more: Blood Model

68. Create cool colors with candy

Learn about diffusion in the sweetest way! Grab a bag of Skittles for this quick and easy 4th grade science project.

69. Wow them with glowing water

Your students will ooh and aah at the result of this exploratory way to show phosphors in action with a black light, different types of water, and a highlighter. The results of this experiment might surprise both you and your students!

Learn more: Glowing Water Experiment

70. Make a bottle rocket

Break the class into small groups and then have them work together to piece together the various parts of the rocket. It might be helpful to have the shapes pre-cut. This 4th grade science project is best done outside.

Learn more: Bottle Rocket Experiment (Guide + Printable Reflection Sheet)

71. Use apple slices to learn about oxidation

Have students make predictions about what will happen to apple slices when immersed in different liquids, then put those predictions to the test. Have them record their observations.

Learn more:  Apple Oxidation

72. Explore density with one cup

This experiment is similar to others on our list about density but utilizes just one glass. Begin by pouring syrup into the bottom of a glass and then adding water and finally cooking oil. This alone will amaze your students as the liquids separate due to their density. Finally, try dropping items of different weights into the glass.

73. Make a heart model

This is such a simple and fun way to teach kids about the human heart. All you’ll need is a glass, a red balloon, red food coloring, water, and a straw.

74. Experiment with magnetic slime

Slime is obviously a favorite science experiment for kids, but the addition of iron filings really takes this up a notch. Get some magnets and let kids experiment with the magnetism.

75. Make a model river

This one might take some time, so it could be assigned as an at-home project. Have them complete their own river bed while completing a unit on geography and topography.

76. Whip up some fluffy slime

What’s better than a slime recipe? A fluffy slime recipe!

Learn more: How To Make Fluffy Slime (Guide + Printable Reflection Sheet)

77. Turn milk into cheese

Turning milk into cheese using just vinegar is a brilliant way to teach young students about chemistry and chemical reactions.

78. Dissolve sugar

This experiment is a simple way to demonstrate solubility. The positive and negative parts of the water molecules are drawn to the positive and negative parts of the sugar molecules, thus resulting in the absorption.

Keep the STEM excitement going with these Fantastic Free 4th Grade Math Games .

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How To Make Slime: 4 Recipes Plus Free Worksheet

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All Science Fair Projects

1000 science fair projects with complete instructions.

74 Science Projects for 4th Graders

Looking for science projects for 4th graders? Our fourth grade science experiments are engaging, fun and educational, making them a great starting point to inspire a love of science.

4th Grade Science Project FAQ

What are some easy 4th grade science fair projects.

Explore these fascinating 4th grade science experiments that are not only easy to do but also make science fun! Get ready to be wowed while discovering important scientific concepts!

Sinking Through Water

Egg with Vinegar

Does Milk Help Plants Grow?

Magic Milk Painting

Breakfast and School Performance

Plant Growth and Water

Sparkling Rainbow Crystal

Plastic Milk

Does Dog Saliva Kill Bacteria?

Super Hero Egg Shells

Science fair project details right above the FAQ!

What is the best 4th grade science fair project ever?

We love the Plastic Milk science project for 4th graders. Turning milk into plastic may seem like a magic trick, but it's a classic experiment that demonstrates how heat and acid can make milk plastic-like! Young scientists will learn about the precipitation of solids and the chemical reaction between acids and bases from this cool experiment! Check out the videos to see how to make lego figures or glue from this science experiment!

Check out more Best Science Fair Projects →

What are some cool 4th grade science projects?

Get ready to be amazed by these super cool fourth grade science experiments! Choose a science experiment that catches your interest, and with just a few simple materials, you'll discover how awesome and fun science can be!

Create a Tornado in a Bottle

Electrifying Lemon Battery

Making Oobleck: Liquid or Solid?

Egg Drop Project

Colors of Skittles Experiment

Cloud in a Bottle

Science fair project details at the top of the page.

What are 5 testable questions for 4th grade?

A testable question is a question that we can answer through a science experiment. To do this, we do a control science experiment, then we change one thing in the experiment to see how it affects the result. This is how we can discover the answer to our question!

Explore science projects with these testable questions for fourth graders (find the projects at the top of this page):

What makes a cloud form?

Can drink and food taste different just by changing its color?

Does the color of light affect photosynthesis?

Does temperature affect seed sprouting?

What makes popcorn pop?

Here are more testable questions along with their science projects →

What are the top 10 science projects for 4th grade?

We've handpicked these top 10 science projects for 4th grade which dive into biology, chemistry and physics science experiments. Whether you're looking for a fun experiment or aiming to do an awesome science fair project, these science projects have got you covered!

Shrimp Habitat Preferences

Exploring the Relativity of Time

Science project details at the top of the page!

Can I do a 4th grade science fair project in a day?

Absolutely! Quick experiments using simple materials that you can find at home are an excellent choice for a one-day science fair project! It's ideal to do a simple science project with a fast chemical reaction, like the following projects.

Acid-base reactions: Mixing acids with bases quickly makes carbon dioxide gas!

Make a rocket fly sky high with just baking soda and vinegar! Rocket Film Canisters

Learn how to make your own acid/base indicator using red cabbage and use it to test different fluids! Make Your Own pH Indicator

Chromatography reactions: Separate out colors!

Did you know that some Skittles have a secret rainbow hiding inside them? Colors of Skittles Experiment

Have you ever wondered why leaves change color in the fall? Let's find out by using chromatography to separate the colors of a green leaf! Uncovering Fall Colors

Heat reactions: Heat speeds things up!

Do you want to find out which color candle burns the fastest? Which Candle Burns the Fastest?

What are some hands-on ways to find inspiration for my science fair project?

There may be free admission days or free passes to a science museum near you! Check your local library for free museum passes, nearby science museums for free entrance days and your credit card for offers.

Find a science museum near you and prepare to be awed by all that you can learn there! I always learn something new and am inspired whenever I go to a science museum!

How do I start a science fair project?

What should I do after I have a science fair project idea?

How do I make a science fair board?

What is the scientific method?

What is the engineering design process?

Where can I find a science fair competition?

The www Virtual Library: Science Fairs website also has a collection of science fairs from all over the world, as well as national, state, regional, local, and virtual competitions!

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4th Grade Science Projects: Experiments, Challenges, Explorations, And More

October 14, 2023 //  by  Lauren Du Plessis

Our list of unique science projects is a sure winner when sourcing ideas that are appropriate to the 4th grade learner. Science is a vital component of STEM-based activities and our top 57 project ideas are sure to increase creativity, develop critical thinking abilities as well as effective communication and collaboration skills.

1. Flashlight Creation

Discover simple electric circuit rules when creating this nifty paper flashlight! This project is the perfect experiment for kids as it’s sure to highlight the science behind batteries.

Learn More: Flashlight Creation

2. Lemon Volcano

Have a blast creating this erupting lemon volcano! By using average household supplies, 4th graders discover the properties of both acids and bases and learn how the interaction between them causes a chemical reaction.

Learn More: Lemon Volcano

3. Earthquake Simulation

Set a dish of jelly and then go about building a structure on it. Upon completion of the structure, wobble the dish so that the jelly shakes and disrupts the structure- in turn demonstrating the science of seismology.

Learn More: Earthquake Simulation

4. Design a Hovercraft

Time after time, this proves to be one of the best experiments for demonstrating the power of the air. Unveil properties of friction and air pressure as you design a floating hovercraft!

Learn More: Design a Hovercraft

5. Make a Microscope 

A cause for STEM excitement! This wonderful project demonstrates how water droplets curve to create a convex lens and in turn, refract light and magnify objects.

Learn More: Make a Microscope

6. How Chameleons Change Color

Create a mesmerizing color show as an interactive poster that demonstrates how chameleons change color ass the middle wheel spins.

Learn More: How Chameleons Change Color

7. How Your Body is Similar to a Car

Just as we source our energy from food, cars source theirs from gasoline. Further, demonstrate how energy is stored and released with the help of simple materials such as rubber bands.

Learn More: How Your Body is Similar to a Car

8. Discover Newton’s Law

With the aid of a string of beads, highlight Newton’s Law of Gravity as the beads are tugged ever so slightly and then begin to fall from the cup.

Learn More: Discover Newton’s Law

9. Egg Drop

Students are encouraged to source material from home that they will use to create a protective barrier for their egg before dropping it to measure the effectiveness of their contraption in preventing their egg from cracking.

Learn More: Egg Drop

10. Static Electricity Science

Discover the science of static electricity in a fun way by building an electroscope to demonstrate the forces of attraction and repulsion!

Learn More: Static Electricity Science

11. Demonstrate Water Erosion

This hands-on, ocean science project is perfect for teaching students about coastal erosion and requires the use of simple materials such as a dish, sand, plastic bottle, stones, and water.

Learn More: Demonstrate Water Erosion

12. Milk Plastic

This unique experiment can lead to hours of crafting fun as 4th grade students learn how to create plastic from milk!

Learn More: Milk Plastic

13. Salt Water Density Experiment

The properties of water and density are highlighted in this science project as children discover that saltwater is denser than normal water.

Learn More: Salt Water Density Experiment

14. Make Unstoppable Bubbles

By combining the traditional soapy bubble mixture with glycerin, students learn about how the original mixture evaporates from stronger bubbles.

Learn More: Make Unpoppable Bubbles

15. Discover More about Blood Components

Biology is an important component of life but should be approached in a fun and simplified manner when working with 4th graders. Discover more about blood components by crafting “blood” model jars!

Learn More: Discover More about Blood Components

16. Could Dominoes knock a Building Over

Discover the effects of chain reactions with the help of this easy science fair project idea before posing the question of whether or not dominos could knock down a building!

Learn More: Could Dominos Knock a Building Over

17. How Neon Signs Work

By making use of a small gas tube in this cool experiment, 4th graders will be intrigued to learn about how neon signs work.

Learn More: How Neon Signs Work

18. Anemometer

Discover wind speed with the help of your very own anemometer! Simple earth science is unveiled with the help of a simple garden contraption made from paper cups, straws, tape, a pencil, and a thumbtack.

Learn More: Anemometer

19. Make Recycled Paper

Although making recycled paper can at times be a process, it is extremely satisfying! Students watch how water is first absorbed by their shredded paper and then, towards the end of the process, how it is drained away- leaving a recycled piece of paper in its place.

Learn More: Make Recycled Paper

20. Nonrenewable Resources

What better way to highlight the depletion of non-renewable resources, than by making use of noodle- mining in a competitive game or project! This hands-on activity is perfect for elementary-age students to use as an earth science project.

Learn More: Nonrenewable Resources

21. Balloon Rocket

This simple, yet fun, activity depicts Newton’s law of motion perfectly. By using household materials such as a balloon, straw, clothespin, and line, your students will discover that for every action, there is an equal or opposite reaction. Ready for blast off!

Learn More: Design Dazzle

22. Cloud Science

With the help of this exciting cloud science project, your 4th grad students will grasp the concept of the water cycle in no time! With the help of a paper cup, plastic zip-top bag, tape, and water students discover how water moves from the ground into the air, then forming clouds before falling back to earth as rain.

Learn More: Cloud Science

23. Blow up a Balloon with Vinegar and Baking Soda

Intrigue 4th grade science students with this experiment that sees balloons magically inflate when baking soda and vinegar combine and generate carbon dioxide.

Learn More: Blow up a Balloon with Vinegar and Baking Soda

24. Cellphone Projector

Not only is this a great science project, but most of the materials used are recycled materials. This simple project is perfect for teaching complex rules such as the refraction of light.

Learn More: Cellphone Projector

25. Create a working elevator 

Students are encouraged to make use of various materials in order to create a working elevator that has a crank and is able to bear a load.

Learn More: Create a Working Elevator

26. Ocean current simulator 

By making use of water, food coloring, an empty dish, and plastic sea creatures, students learn how ocean currents are formed in this simple science project.

Learn More: Ocean Current Simulator

27. Bacteria grower

A simple Agar solution, that has been set in various Petri dishes, is the perfect breeding ground for bacteria. Swab items that the students use on a daily basis and wipe the swab’s on the dishes, then leaving them covered in order to grow and visually depict that bacteria are hiding all around us.

Learn More: Bacteria Grower

28. Wiggle Bot

Craft your very own Wigglebot! Using simple tools and supplies, 4th graders have the opportunity to work with potential energy in a fun manner!

Learn More: Wiggle Bot

29. Crystal names

Make science fun as students grow an edible, crystalized version of their names on pipe cleaners ! This is just one of the many edible science projects out there for kids so be sure to get creative and see what you can make!

Learn More: Crystal Names

30. Capillary Action

Teach the concept of capillary action with this spectacular rainbow glass display! This is a fantastic opportunity for students to learn about color mixing and how water travels.

Learn More: Capillary Action

31. Design a Working Lung Model

Explore more about the natural phenomenon of breath with this cool project. Design a working lung model using a plastic bottle, straws, balloons, sticky tape, and scissors.

Learn More: Kiwi Co

32. Make It Glow

Discover which water mixture will glow using black light to test regular water with highlighter dye, tonic water, and tap water.

Learn More: Cool Science Experiments HQ

33. Explore Tooth Decay

Learn about tooth decay using eggs and an assortment of drinks such as sugar water, soda, and milk. This project is wonderful for visually illustrating the effects of sugar products on teeth.

Learn More: Sciencing

34. Build a Hygrometer

Measure humidity with the help of your very own hygrometer made from a piece of wood and plastic, nails, a dime, glue, tape, a hammer, and a pair of scissors.

Learn More: We Have Kids

35. Discover Osmosis

Learn about osmosis with the help of this fun and colorful gummy bear science project!

Learn More: Homeschool

36. Rotting foods 

This experiment helps to develop thorough observation skills. Reveal which, out of an assortment of foods, will be the first to rot and discover what accelerates the process.

Learn More: No Time for Flash Cards

37. Create a Sundial

Turn back time as you craft an old-fashioned mechanism that helped ancient civilizations such as the Egyptians, Mayans, and Babylonians tell the time.

Learn More: Explorable

38. Make a fossil

Learn how fossils are formed as you leave your mark in a plaster of Paris cast. Consider casting an imprint using a toy to make this activity even more fun!

Learn More: YouTube

39. Build a Rubber Band Guitar

Explore the science of sound as you build a rubber band guitar using a heap of rubber bands and other simple materials.

Learn More: BBC Good Food

40. Make a Water Microscope

Make a microscope to allow you to examine certain objects in greater detail. You’ll need a piece of fuse wire, water and an assortment of objects to look analyze.

Learn More: Science Kids

41. Skittles Spectacular

Roll out the rainbow with this fun project!  Demonstrate the diffusion process to your class using Skittles. This colorful experiment will certainly intrigue your pupils and make them eager to learn more. To carry it out, simply have your kiddies place a few Skittles on a plate and cover them with water before stepping back to watch the reaction that takes place.

Learn More: Rookie Parenting Science

42. Water Wonders: Sink or Float

This idea provides an excellent way to foster a healthy curiosity and understanding of fundamental physics principles. Encourage your students to hypothesize which household items will sink or float, before putting their theories to the test by placing selected items into a basin of water.

43. The Sun-Powered Oven Project

Let your students harness the power of the sun by using a pizza box and transforming it into a solar oven. They can easily harness the sun’s rays by wrapping the box in aluminum foil and other materials to figure out the best way to capture the heat and then get baking. This is an engaging and memorable way to introduce solar energy that’s sweetened by the chance to make and enjoy s’mores!

Learn More: Science Buddies

44. The Journey of a Light-Chasing Plant

Start your lesson with a question: Can plants solve mazes? The concept of phototropism will come alive as your students try to solve this problem by guiding a small plant through a simple cardboard maze toward the light. The result? A thrilling, real-time adventure demonstrating a plant’s instinctual growth response to sunlight that your class will love.

Learn More: Mama Smiles

45. Pinecone Predictions

Challenge your class to be better than the weatherman! Teach your youngsters about humidity and weather changes using a humble pinecone. Simply hang a few cones around the school and prompt your children to observe them; open or closed tells a story about the humidity. They’ll be fascinated to discover how the pinecone’s responses can predict weather conditions.

Learn More: Play to Learn Preschool  

46. Fruit-Powered Fun

You can turn everyday fruits into a source of electricity and marvel with your students as lemons, oranges, or apples light up a bulb or power a digital clock. All you need is a piece of fruit, some wire, and a few nails to engage your learners in a  hands-on project that illustrates the concept of electrical circuits.

Learn More: Kids Activities Blog

47. Shadow Dance

Embark on a day-long shadow-tracking exercise with your students to understand more about the Earth’s rotation. To do so, have them record the changing shadow of a stick at different times throughout the day to visually depict the Earth spinning on its axis. 

Learn More: Inventors of Tomorrow

48. Popsicle Power Play

Allow physics to meet creativity when you encourage your students to construct a catapult out of popsicle sticks and elastic bands. To begin, have them research the best methods for creating the most force. As your kiddos thrill in testing which items the catapult can launch and whose items travel the furthest, they’ll be learning about the concept of potential and kinetic energy transformation.

49. Greenhouse Effect Model

Using jars, thermometers, and plastic wrap, you can simulate the greenhouse effect right in your very own classroom. Provide your students with the necessary materials and instruct them to add the same amount of ice to each jar. Then, have them wrap one jar in plastic and leave the other open before placing them in the sun for a few hours. Lastly, prompt your young scientists to formulate their conclusions after measuring the temperature in each jar. 

Learn More: STEAM Powered Family

50. Pulling with Pulleys

Mechanical advantage and work take center stage in this hands-on activity. By encouraging your young scientists to create a simple pulley system with a spool and string, they can explore mechanical advantage and the concept of work. This hands-on project will help you make complex physics principles that much more observable and fun.

51. Determining Densities

Allow your learners to explore density in a hands-on activity of the senses. As they pour honey, dish soap, water, and oil into a clear container, the differing densities will reveal themselves in a striking visual display.

52. Edible Genetics

Sweets in a classroom seem to have a magical attention-grabbing power. Use this to your advantage when teaching genetics by having your students create an edible DNA model. With colored marshmallows or jelly sweets and toothpicks, they’ll come to understand the double helix structure in a fun, tasty way.

Learn More: Hess UnAcademy

53. The Rainfall Recorder

This is an easy project that introduces practical meteorological skills and fosters scientific curiosity. Empower your students to measure rainfall and track this over time with a homemade rain gauge. Use an empty bottle with the top cut off and then instruct your class to carefully fill the bottle in 20 ml increments; carefully marking the lines to ensure accuracy. 

54. Magnetism Unveiled

Reveal the hidden world of magnetic fields to your students by engaging them in a project that uses a bar magnet and iron filings. They can simply lay the magnet under a piece of thin card stock and sprinkle the filings over the card. The result is a practical way for your budding scientists to visualize the unseen forces of magnetism; fostering a deeper understanding of this fundamental physical phenomenon.

55. Miniature Volcanic Eruption

Unleash the dramatic spectacle of a volcanic eruption in your classroom. Have your kiddos create a volcanic mountain with a cup in the center. Add baking soda to the cup and then slowly pour in the vinegar; resulting in a chemical reaction that will blow your young scientists’ minds. 

56. Invisible Ink Adventures

Introduce your students to the secret world of invisible ink with lemon juice. Get ready by preparing lemon juice, a brush or cotton swab, white paper, and a heat source. Ask your students to dip their brushes in lemon juice and use them to write or draw on the piece of paper. Then, help them carefully heat the piece of paper with a light bulb or iron to the secret message. It’s a playful way to learn about acidic and basic properties and will allow your young investigators to reveal hidden messages just like detectives.

57. Oil Spill Cleanup Challenge

Conduct an environmental experiment with your class by simulating an oil spill using feathers, oil, and various cleaning materials. To a shallow tray, add water before scattering a few small feathers and then slowly spilling the oil into it. Once they’ve had the chance to marvel at the unique patterns that the different liquid densities create,  challenge them to solve the problem of removing the oil. This hands-on activity will emphasize the impact of pollution on the environment; helping you spark thought-provoking discussions about conservation and responsibility.

Learn More: Super Teacher Worksheets

The activities we’ve provided are perfectly adaptable and may be employed in individual, pair, or group settings. Be inspired to design creative classes with the help of our comprehensive list of science projects above. We strive to make learning fun whilst still highlighting the key concepts of science in a simplified manner.

Frequently Asked Questions

Why is science important for 4th graders.

Science-based learning at an elementary level introduces students to a STEM-based classroom focus and opens them up to STEM-related careers at a young age. Students discover key concepts about the world around them- unveiling properties of water, electrical currents, animals, ocean currents and so much more along the way!

Is your 4th grader getting ready for his/her first science fair? Fear not, we have rounded up a list of 25 great fourth grade science fair ideas to get you started! Remember, the whole point of a science fair is for your child to learn about science in a hands-on way, so resist the temptation to “help” too much. Plus we’ve deliberately chosen easy projects that your fourth grader should be able to do with minimal supervision or help from an adult.

In this post, we’ve assembled 25 easy science fair project ideas for 4th grade. We link each project description to its original source, where you can get more information and step-by-step instructions.

Volcano Science

Learn all about volcanoes, then make one of your own!

Recommended for Grades 4.

Source: www.scienceprojectlab.com

When life gives you lemons, make a battery!

Lemon Power is a fascinating experiment that you can attempt to duplicate with other fruit. Which fruit makes the best battery? Experiment and find out!

Recommended for Grades 4-5.

Source: www.kidsactivitiesblog.com

A Science Fair Project on Tooth Decay by Jennifer Elrod

Doing an experiment on tooth decay is both beneficial and interesting. It only requires a few inexpensive materials and a week’s worth of observation and record keeping. The experiment requires no work after the initial setup.

Source: www.ehow.com

Homemade Lava Lamp by Alexa Bach McElrone

This project takes about 2 hours to complete the experiment and the write-up. Kids will get to explore the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

Source: http://www.education.com

How the Amount of Light Affects Germination and Growth.

The goal of the project is to find out how different lighting conditions affect seeds germination and growth. This article will give you the step by step procedure for this project.

Growing Bacteria in Petri Dishes by Steve Spangler

A Petri dish prepared with nutrient agar (a seaweed derivative with beef nutrients) is an ideal food source for the bacteria you’ll be growing. Collect samples from around the house or classroom and record the results for the one with the most bacteria.

Source: www.stevespanglerscience.com

Bridge Project by Sarah Benton

This project explores the basic physics of bridges. The goal is that the student will develop an understanding through experimentation of which shapes are the most structurally strong, and that many factors are taken into account in engineering and building.

Source: www.education.com

Paper Airplane Science Fair Project

Create your own hypothesis about paper airplanes, then start your experiment. This article gives you all of the information you need.

Source: www.easy-science-fair-projects.net

Barometer Science Project

Make your own barometer and then use it to test weather conditions on a dry day, a rainy day, a cloudy day, etc.

Source: www.hubpages.com

How Do Antacids Work?

In this activity, learners explore the chemical reaction between water and effervescent antacid tablets. This hands-on activity models how a material can act differently when it’s nanometer-sized. Learners compare the reaction rate of an effervescent antacid tablet that is broken in half with one that is broken into many pieces.

Source: www.howtosmile.org

Gummy Bear Osmosis

Do Gummy Bears dissolve in water? In vinegar? In liquid soap? Test your hypothesis on a variety of liquids and find out.

Source: www.homeschool.com

Is Your Dog’s Mouth Cleaner than Your Mouth?

Is it a myth or fact that a dog’s mouth has less germs that a human’s mouth? Follow these simply instructions and test for yourself.

Does Mint Actually Cool Things Down? By Jennifer Penn-Chiu

Mint-flavored gum, breath fresheners, and hard candies often advertise that mint has a cooling effect, and use images of frost and ice to demonstrate this sensation. But is this sensation a result of the mint actually lowering temperatures?

Which Food Will Rot First?

This example tests the rotting of 4 different foods, but your scientist can test as many different types of food as they can imagine.

Source: www.notimeforflashcards.com

Helmet Crash Test by Steve Spangler

Not only will your little scientist gain a better appreciation for using a helmet, she can also learn more about the science behind it. Try testing different size melons and different height drops.

Source: www.parenting.com

Can Magnets Affect the Growth Process of Radish?

In this experiment, your scientist will determine whether magnets make radish plants grow faster or slower.

Source: www.buzzle.com

Playground Teeter-Totter

The goal of this project is to create a compound machine using pulleys and levers that would be able to lift a Barbie doll up and down by pulling a string by the player. A common problem on the playground is that you sometimes can’t find another person to go on the teeter totter with you.

Recommended for Grades 4-6.

Source: www.projects.juliantrubin.com

Growing a “Mold Garden”

The goal of this project is to grow different mold species on different kind of substrates to find out if the same bread mold species will grow on all of them. Do all mold species have the same taste and preferences?!

Recommended for Grades 4-5

Source; www.scienceprojectlab.com

Making a Simple Sundial and Testing Its Accuracy

Learn how to make a sundial and then test its accuracy with a series of experiments.

Recommended for Grades 4-6

Source: www.explorable.com

A Pint Pot Planet

This experiment will demonstrate the water cycle and test different hypotheses on rainfall and the water cycle.

Source: www.raisingsparks.com

Build and Test a Paper Bridge

This project helps you discover how to create a strong bridge using just paper. Instructions also offer some additional parameters to add into the experiment.

Recommended for grades 4-5

Source: www.teacherstryscience.org

Paper Airplane Experiment

Experiment to find the best design for a paper airplane

Source: ScienceFairMath

Use the Energy in a Peanut to Heat Water

Just about everything has potential energy stored in it. The problem is releasing that energy to be able to do some work.

A tiny peanut contains stored chemical energy. When we eat them, the stored energy is converted by our bodies so we can do work. We can also use the energy in a peanut to heat a container of water.

Recommended for grades 4-6

Source: www.energyquest.ca.gov

Oil Spill Experiment

This experiment will demonstrate the detrimental effects of oil spills to marine life

Make Your Own Microscope with Water

Make a simple microscope using water and take a closer look at the world around you.

The lens you create with water works like a microscope or magnifying glass, allowing you to see objects in much greater detail than if you were just looking with the naked eye.

Source:  www.sciencekids.co.nz

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The Best 4th Grade Science Experiments and Activities

by Chloe Campbell Leave a Comment

As a 4th grade science teacher, I know how exciting it can be to get students engaged in hands-on learning. There’s nothing quite like seeing young scientists light up when they discover something new through experimentation. In this blog post, I’ll share some of the best 4th grade science experiments and activities that not only cover key science concepts but also keep your classroom buzzing with excitement.

Whether you’re teaching about speed, sound energy, electric currents, or rock formation, these experiments will be the perfect way to get your students fully involved. Plus, they all use simple supplies that are easy to gather, making them great for busy teachers!

Table of Contents

1. 4th grade science experiments: hands-on fun with scientific method experiments.

For a comprehensive approach to the scientific method, I developed  10 Fun Easy Science Experiments that you can use with your 4th graders. These activities guide students through the scientific method, offering hands-on experiments that encourage independent work while covering key 4th-grade science concepts. This is a perfect way to teach students how to follow procedures, record data, and draw conclusions, all while having fun with easy-to-set-up science activities.

All of these science experiments use common household items which makes them easy to prepare for.  These  fun and easy science experiments  are perfect for introducing science lab rules, teaching science procedures, modeling the scientific method, or adding some scientific fun to any day of the year! 

The 10 Science Experiments are:

• Which airplane design flies the farthest distance?
• Does the amount of air change the distance the balloon travels?
• Which soda reacts the most to Mentos?
• Which ramp design allows the ball to move the farthest distance?
• What liquid cleans pennies the best?
• Which liquid allows the gummy bears to grow the most?
• Exploding Baggies
• Marshmallow Catapults
• Apple Volcanoes
• Ice Cream in a Bag

2.  Exploring Sound Waves with Rubber Bands

One of the coolest 4th grade science experiments is using rubber bands to explore sound energy. All you need are a few rubber bands of different sizes and thicknesses, and your students will be able to see (and hear!) how different vibrations create different pitches of sound. This simple experiment is a great way to teach sound waves and energy transfer. It’s hands-on, easy to set up, and really fun for fourth graders.

If you want this experiment done for you,  plus  get access to two other experiments for sound, I’ve got them ready for you in my  Sound Energy  resource.

3.  Speed and Collisions: The Ping-Pong Ball Race

This experiment is an exciting way for students to understand speed and collisions. Use a ping-pong ball, a ramp (you can use books), and different materials like paper towels or foil to see how surface affects the speed of the ball. You can even add in rubber bands to test how different tensions influence speed! 

Next, have students roll ping pong balls at one another. The goal of this is for the ping pong balls to collide with one another. Have students hypothesize what they think will happen when the ping pong balls collide. Were the ping pong balls going the same speed? Different speeds? Did they hit each other head-on, or at an angle? This is a fun science experiment that helps students grasp the idea of speed and kinetic energy.

4.  States of Matter with Ice Cube Melting

Teaching about the states of matter can be interactive with this simple science experiment. Give students an ice cube, a glass jar, and a paper towel, and let them observe how an ice cube melts over time. You can talk about energy transfer and how heat energy causes a solid (ice) to turn into a liquid (water). It’s a fun way for students to see the concepts of physical science in action.

If you want to make this learning even deeper, you can challenge your students to design a way to prevent the ice cube from melting. This helps students understand how to slow down changes in states of matter, and it’s also a great connection for learning about insulation.

5.  Static Electricity with Balloons

Another favorite among 4th grade science experiments is exploring static electricity. Grab a few balloons and let your students rub them on different materials to see what creates the most static charge. This fun experiment is great for teaching about electric currents and static electricity—plus, it’s guaranteed to get lots of laughs as students see how their hair stands on end!

If you want this experiment done for you,  plus  get access to two other investigations, I’ve got them ready for you in my  Static Electricity  resource.

6.  Rock and Soil Formation with a DIY Erosion Experiment

To cover earth sciences, try this fun activity where students can observe soil erosion. You’ll need plastic bottles, some soil, and water to simulate the effects of water on different types of soil. This experiment ties into lessons about weathering and erosion, and it gives students a better understanding of how rocks and soil change over time. It’s an interactive way to bring earth science concepts to life.

• As the water runs down the slope of the soil, students will see how the soil starts to move. Encourage them to closely observe what happens—does the soil stay in place, or does it start to wash away?
• Cut plastic bottles in half horizontally. Each half will represent a hill. Make sure you have one bottle for each group of students.
• Fill the bottle halves with soil, leaving a little space at the top.
• Instruct each group of students to use a plastic cup with holes poked in the bottom or a spray bottle to simulate rainfall. Have them gently pour water over their “hill” (the soil-filled bottle) to see how water affects the soil.
• You can also have students vary the intensity of the water: some can pour a light drizzle, while others can pour faster to simulate heavier rain. This will show how different amounts of water impact soil erosion.

7.  Chemical Reactions: Baking Soda and Vinegar Volcano

No list of 4th grade science experiments would be complete without a classic baking soda and vinegar experiment. This experiment demonstrates a chemical reaction and can be turned into a mini volcano. Mix baking soda and vinegar in a plastic bottle, and let your students watch the fizzing reaction occur. It’s a great way to introduce the scientific method while exploring the properties of different substances.

8.  Energy Conversion with Glow Sticks

If you want to teach about energy conversion, glow sticks are a perfect tool! Simply snap the sticks to activate the chemical reaction, then discuss how the stored energy in the glow stick is converted to light energy. This cool experiment not only helps students understand energy but also is a great project to discuss how light energy works.

You can even turn this learning into another experiment where students determine what temperature of water makes glow sticks glow brighter, glow longer, and more. You can find this experiment ready to go for you in my  Halloween Science Activities  resource.

These 4th grade science experiments are a fantastic way to spark curiosity and excitement in your students. From exploring sound waves to witnessing chemical reactions, these activities provide a variety of learning experiences that cover essential topics like energy transfer, states of matter, and more. The best way to teach science is through exploration, and these experiments are the perfect way to bring the wonder of science into your classroom.

So go ahead, gather your supplies, and let your students dive into these fun kids’ science experiments!

Looking for more experiments?

Check out my Easy Science Experiments Bundle, which includes access to 60+ experiments!

Don’t have time to digest all of this information right now? Want to save these experiments for later? No worries! Click the picture below to pin this to your favorite Pinterest board!

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