In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

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

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!