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Introduction

Even though you cannot feel it, see it, or smell it, air surrounds you and extends far upward for miles. AirGaseous mixture that covers Earth, composed mainly of nitrogen (about 78 percent) and oxygen (about 21 percent) with lesser amounts of argon, carbon dioxide, and other gases. is a mixture of gases, mainly nitrogen and oxygen, with about four times as much nitrogen. With few exceptions, all living things on Earth need air to survive. It is what makes all flight possible, from airplanes to birds. It allows fuels to burn and it shields Earth from the Sun's harmful rays. Air is also what gives us our weather patterns. Air's temperature, pressure, density, and volume all create the weather.

1. Introduction
2. Surrounded by air
3. Oh, the pressure
4. Changing densities
5. Experiment 1 - Air Density: Does warm air take up less room than cool air?
6. Experiment 2 - Convection Currents: How can rising air cause weather changes?
7. Design Your Own Experiment