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Jets at High Altitudes

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Why is the air in jet aircraft flying at high altitudes pressurized?

Gases move from regions of high pressure to regions of low pressure. What force keeps the gases of the earth's atmosphere from diffusing into interplanetary space, where the pressure is essentially zero?

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This solution discusses the pressure of jet aircraft flying at high altitude.

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Why is the air in jet aircraft flying at high altitudes pressurized?

This is also known as cabin pressure of the plane. Cabin pressurization is the active pumping of air into an aircraft cabin to increase the air pressure within the cabin. ...

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