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Student ReadingAir is not emptyTo fly, you must pass through the air. Even though we cannot see the air, it is not empty. The air is made up of millions of little molecules that push against our bodies. These particles of air take up space or "have volume". They are made up of matter so they have "mass", too. They also have "weight". Air can exert a tremendous amount of pressure and force. As you rise higher in elevation, like taking a drive into the mountains, you can feel that your ears need to "pop". The air pressure on the outside of your eardrum becomes lower as you gain altitude. You are feeling the greater air pressure inside your inner ear pressing against your eardrum. You can feel the air pushing against you when the wind blows, too. When you move through a room, you push against the air. You change where the air is located and what the air is doing. Knowing that air is not empty space, but is made up of molecules, led to some important understandings of how the wings on an airplane help it to fly.
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