What is the atmosphere?
The atmosphere is the layer of gas that surrounds the earth.
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What are the main 2 gases in the atmosphere?
Nitrogen (~78%) and oxygen (~21%).
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What does altitude mean?
Altitude is the height above the ground. So a higher altitude means higher up in the atmosphere.
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What is atmospheric pressure?
Atmospheric pressure is the total force of all the air particles constantly colliding with everything, from all sides.
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Does atmospheric pressure increase or decrease with altitude?
Atmospheric pressure decreases with altitude (as you get higher up).
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Why does atmospheric pressure decrease with altitude?
The pulling force from the gravitational field of earth becomes weaker as altitude increases, so gas particles spread further apart, and the atmosphere becomes less dense.
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