# Altitude to PSI question

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I have an altitude to psi problem that I can't quite figure out. I know I have to use conversions, but I'm not sure how to set them up.

At an altitude of 35,000 ft, atmospheric pressure is less than 0.500 atm. Convert this pressure to pounds per square inch (psi).

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Nidum
Gold Member
Atmosphere pressure is approximately 14.7 psi at sea level .

So if you know that atmospheric pressure at a specified altitude is 0.5 sea level value then pressure in psi = 14.7 * 0.5 .

nb: The 14.7 psi pressure at sea level is commonly referred to as ' one atmosphere ' .
So two atmospheres = 29.4 psi . Three atmospheres = 44.1 psi etc .

Atmosphere pressure is approximately 14.7 psi at sea level .

So if you know that atmospheric pressure at a specified altitude is 0.5 sea level value then pressure in psi = 14.7 * 0.5 .