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What is the pressure outside aircraft at cruising height? – All about Aircraft
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What is the pressure outside at cruising height?
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For all aircraft related questions see the All about Aircraft section.
What is the pressure outside at cruising height?
The pressure in the atmosphere is caused by the weight of the atmosphere of the overlying atmosphere [force per unit area]. If at a height of z the atmosphere has density ρ and pressure P, then moving upwards will decrease the pressure by an amount equal to the weight of a layer of atmosphere of thickness that has been transcended.
At a cruise altitude of. 30000 ft ambient pressure may be as low as 4.3 psi; compare this to the ground/sea level pressure of 14.7 psi. That is, at cruise altitudes, the pressure inside the cabin could be three to four times the pressure outside!
See also: Scale Height article from Wikipedia
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