In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

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

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

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.

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

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.

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

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

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.

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

In this Bernoulli's Principle experiment, you'll learn how an increase in the speed of a fluid, like air, decreases pressure.

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

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

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

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

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

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?

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

The purpose of this science fair project is to build a basic radio.

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?

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

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

Science fair project which teaches you about the principles of physics within a vacuum by creating a vacuum chamber.

Science fair project that examines condensation and the conditions needed in order for dew to form.

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

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

Learn how to make a hygrometer to measure relative humidity in this project. Make a sling psychrometer hygrometer with gauze, thermometers, and a bottle.