5.5.2 - Atmospheric Pressure

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What happens to the density of the atmosphere with increasing altitude?

The atmosphere becomes less dense as altitude increases.

2
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How is atmospheric pressure created?

Air molecules colliding with a surface.

3
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Explain why atmosphere pressure decreases with an increase in height.

  • Pressure is created by collisions of air molecules.

  • The quantity of molecules (and so weight) decreases as the height increases.

  • This means atmospheric pressure decreases with an increase of height.

4
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What is the Earth’s atmosphere?

A thin (relative to the magnitude of the Earth) layer of gas surrounding the Earth.