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.

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.

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

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.

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.

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.

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.

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

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

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

This science fair project idea explores substances that cause a bubble to last longer.

Explore the chemistry of latex polymers with this outrageous, hilarious science activity.

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

Science fair project that examines albedo, and how this information is applied in the design of cars, sportswear, and other items. Which colors reflect light?

Kids put their geography knowledge to the test in this balloon volley game inspired by the Dr. Seuss book "Oh the Places You'll Go".

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.