Make your own greenhouse - out of a balloon! Your child will learn how greenhouses work as they plant radish seeds and watch them grow.

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

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 exciting design challenge, your child will use design thinking skills to create a mixture that can inflate a balloon.

The objective this science fair project is to determine whether a bigger bag will allow a homemade hot air balloon to fly higher than smaller bag.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

How powerful is the reaction between baking soda and vinegar? Find out here!

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

This science fair project introduces children to static electricity and the idea that electricity is more than lights and plugs.

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

This science fair project idea provides evidence that air is everywhere and takes up space.

Science fair project that examines how temperature affects density and how density in turn affects the behavior of helium gas.

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?

The goal of this science fair project is to demonstrate different ways to generate static electricity and record its effects.

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

This science fair project explains the process of how the lungs expand and contract with the help of the diaphragm.

Create safe lightning for kids! They'll learn how to make lightning at home with this fun science fair project idea illustrating static charges and grounding.

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

What is condensation? Little mad scientists will learn about condensation, states of matter, and air pressure by conducting this cool science experiment.

Science fair project that determines whether mass and weight are the same or different.

Demonstrate how static electricity can cause an object to move. It also examines just how an object affected by static electricity will move.

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

This project investigates the affect of storage temperature on microwave popcorn.