Air Pressure

# Air Pressure - Air Pressure Gravity = Buoyancy All air particles in the atmosphere are drawn by the downward force of gravity But the pressure in

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Air Pressure + Gravity = Buoyancy All air particles in the atmosphere are drawn by the downward force of gravity. But the pressure in the air creates an upward force working opposite gravity's pull. Air density builds to whatever level balances the force of gravity, because at this point gravity isn't strong enough to pull down a greater number of particles. This pressure level is highest right at the surface of the Earth because the air at this level is supporting the weight of all the air above it -- more weight above means a greater downward gravitational force. As you move up through levels of the atmosphere, the air has less air mass above it, and so the balancing pressure decreases. This is why pressure drops as you rise in altitude. This difference in air pressure causes an upward buoyant force in the air all around us. Essentially, the air pressure is greater below things than it is above things, so air pushes up more than it pushes down. But this buoyant force is weak compared to the force of gravity -- it is only as strong as the weight of the air displaced by an object. Obviously, most any solid

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## This note was uploaded on 02/25/2009 for the course ACC 101 taught by Professor Fried during the Spring '09 term at Coastline Community College.

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Air Pressure - Air Pressure Gravity = Buoyancy All air particles in the atmosphere are drawn by the downward force of gravity But the pressure in

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