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From Wikipedia, the free encyclopedia. Vapor density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapor density = mass of n molecules of gas / mass of n molecules of hydrogen. Therefore: vapour density = molar mass of gas / molar mass of H 2.
However, air typically contains a lot of water vapor, which would make it more dense than the cited value. Answer: The density of dry air is 1.29 grams per liter (0.07967 pounds per cubic foot) at 32Â° Fahrenheit (0Â° Celsius) at average sea level barometric pressure (29.92 inchs of mercury or 760 millimeters).