Wondering how we know that air is there? Here's a quick and easy experiment that proves that air may be thin, but it's not too wimpy to block your shot!

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.

Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.

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.

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

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?

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

Take to the air with science by experimenting with helicopter seeds right in your own backyard!

Clouds are formed when warm and cold air meet. Here's a way for kids to see it all up close!

This spider mobile activity encourages learning about the science of motion, air currents and art.

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.

Air-drying clay gives your young artist the opportunity to make a simple bowl that mimics the beauty of an autumn leaf.

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

Encourage your child to learn about air pressure by helping him devise his own squirt gun with a water bottle.

These flying potato poppers make a cool sound, create a celebratory mood, and they can teach your child about the power of air pressure.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

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?

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

Teach your kids about entropy with this fun, easy exercise, and teach your money to dance while you're at it!

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

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

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.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.