As we know there are many layers of the atmosphere of the earth, there are 5 layers as I recall. Troposphere, stratosphere, mesosphere, thermosphere and Exosphere. Everyone knows that when the you fly, the higher you go the altitude increase, and when you fly at a high altitude, you suddenly can't breath. That's because of the air pressure decreasing. Air pressure is used to pressurize air, so that the air stays on the earth. That's why we can breath when we're close to earth, but it's hard to breath when you go away from the earth.
Definition: "Air pressure is the force exerted on you by the weight of tiny particles of air"
(http://kids.earth.nasa.gov/archive/air_pressure)
Definition: "Air pressure is the force exerted on you by the weight of tiny particles of air"
(http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/hght.rxml)
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