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

Free science fair project idea that examines air pollution in local environments. Particles are trapped by petroleum jelly on microscope slides.

Is there more air particulate matter in an urban or rural environment? Test your knowledge with this science fair project.

Compare air temperature with the infrared temperature from a reflecting surface at different times of the day, in shade and in sunlight.

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?

Determine the relationship between the speed of a sound and the temperature of the air it passes through.

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

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!

Check out this fun science fair project idea for middle school students to learn about the effects of temperature on the density of a gas such as air.

Science fair project that measure winds speed, temperature, and time of day in order to determine the origins of the wind.

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

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

Science fair project that creates fog using bottles of hot and cold water.

This simple experiment serves as an introduction to the greenhouse effect.

Have fun with bubbles and find out why there are bubbles in your tap water in this cool science fair project idea.

Check out is fun science fair project idea to learn about heat transfer and why certain insulating materials are more practical than others.

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.

Plants help keep a house cool! This article includes step-by-step instructions for completing this fun and interesting science experiment.

This science fair project idea creates an underwater habitat and explores the basic needs of living things under water.

Kids make strong bubbles to investigate the effect different additives have on bubble life in this cool science fair project idea.

This science fair project investigates how temperature of a room affects the burn rate of a candle.

Study the effects of wind and temperature on evaporation. Place wet sponges in different environments, check at regular intervals, track time required to dry.

Check out this cool science fair project idea to explore the risk of mechanical deterioration of artifacts placed in a storage box due to mold outbreaks.

Solve the mystery of the unpoppable balloon in this 7th grade science experiment that demonstrates the process of heat transfer.

Save money by making compost! Use this science fair project idea to determine which composting methods best encourage decomposition of organic matter.

Explore the best way to store popcorn kernels. It examines the impact of moisture and temperature on unpopped kernels.