In class we filled out a diagram about air pressure. Air pressure is consists of water vapor, elevation, and tempeture. At a high altitude there will be less pressure which would have a lower density also. At a lower altitude there will be more pressure which will also create a higher density. Did you know that, the earths atmosphere is pressing against you with a force of 1k per square cm. Also, the air in your body balances out the pressure from outside so your body doesn't get all squished, it stays nice and normal. I thought that this diagram was boring but it taught me a lot so that was a-okay.
To learn more about air pressure go to :
http://kids.earth.nasa.gov/archive/air_pressure/index.html
Also, this is a picture of a air gauge. It tells you how much pressure is in the item your wondering about.
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