Bernoulli's equation
An airplane flying at high altitude contains 100m^3 of air at STP(273 degrees and 1 atm). If a 1cm^2 hole suddenly develops in the cabin wall, how long will it take for cabin pressure to drop by half?
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So you need Bernoulli's equation to solve this.
Inside the cabin you are at STP  so you know P1 and the specific gravity of air at STP...
I suggest that you assume p2 is zero (high altitude). That ...
Solution Summary
Bernoulli's equation is applied. The cabin pressure applied in an airplane flying at high altitude are given.
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