The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

This science fair project idea produces varying pitches of sound.

How do series and parallel circuits work, and which produces the brightest light in a light bulb? Construct both in this project and find out!

This experiment that explores water and air pressure will amaze your fifth grader as it appears that a single card is holding water in an upside-down glass.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

This science fair project idea experiments with spinning color wheels and optical illusions.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

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.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.