The atmospheric pressure varies with height according to the following barometric formula:
P = Pgas x e (-gMh/RT)
Pgasis the partial pressure of the gas at atmospheric pressure and sea level. M is the molecular mass of the gas, his the height in meters and g = 9.8 m.s-2.
Assuming that air is 20% O2 and 80% N2 at sea level and the atmospheric pressure is 1.00 atm, what is the partial pressure of O2 at a height of 46,200 feet? The temperature at this altitude is
-73.0oC. Note: 1 yard = 3 feet and 1 m = 1.1 yards.