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Kids discover what a homogeneous mixture is by adding sugar to distilled water and identify the various factors affecting solubility.

Science fair project that determines what percentage of air is made up of oxygen by examining the chemical reaction between oxygen and rust.

Demonstrate the capillary function in plants by adding food coloring to glasses of water. Slice stalks of celery and leafy tops. Compare color of leaves

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

In this science fair project, students make their own rain gauge to measure rainfall.

Tin can phones offer something modern versions don't—a fun project to make with a friend, and a dramatic illustration of vibration and sound waves.

This experiment examines whether social orientation (extroversion or introversion) is correlated with memory.

Science fair project the demonstrates Newton's Third Law using a milk carton filled with water.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

In this science fair project, students examine how the flow rate in a stream affects the growth of aquatic plants.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

In this fun science experiment, make a balloon car and test it on different surfaces to learn about sliding friction and rolling friction.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Make a periscope with milk cartons and mirrors! This preschool activity is great for playing secret agent and learning simple physics.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This science fair project idea shows how a vibrating object transfers energy to whatever it touches.

In this cool elementary school science fair project idea make a model to learn what happens to the Earth's surface when ice moves over land.

Construct and experiment with a periscope using reflected light rays to gather an image.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

Demonstrate which cooking method gets rid of the most fat.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

In this challenge, students are tasked with creating a car that can be powered by a balloon!

Kids build a rainforest food web to explore trophic levels in this cool science fair project for 4th grade.

Science fair project which measures whether tsunamis are more destructive when they are caused by an earthquake or by a meteor.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

In this fun experiment, we'll find out how color affects heat absorption!

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.