What is the formula for finding the mass of air?
by 
The Curious Bag
ANSWERS: 1
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The mass (or density) of dry air varies according to elevation, pressure, and temperature, but may be calculated using a variation of the Ideal Glass Law, pV = nRT, which can be simplified to ρ = p/RT, where: ρ= density p = absolute pressure R = individual gas constant T = absolute temperature At one atmosphere and 273 degrees Kelvin (0 Celcius): p = 101,325 Pascals R = 286.9 Joule/kgK T = 273 Kelvin Therefore, ρ = 101,325 kilograms/(meters x seconds squared) ÷ 286.9 kilogram x meters squared/(kilograms x seconds squared x degrees Kelvin) x 273 K = 1.2937 kilograms per cubic meter (kg/m cubed).
Source:
Engineering Toolbox: Molecular Mass of Air
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