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Air density calculator

Calculate the density of humid air :

Be sure to use the correct units and change the default values if necessary:

Air temperature:           ºC

Relative humidity:         %

Atmospheric pressure:  millibar


Note 1: This calculator does not check that the conditions entered are valid for air in it's gaseous state. At very low temperature & high pressure, air may be liquified, in which case the result returned may not be valid. At normal atmospheric pressure, air liquifies at approximately -196ºC

Note 2: Water vapour reduces the density of air, which at first may seem counter intuitive. It's because the molecular mass of water at 18g/mol is less than that for dry air; 29g/mol. The water vapour molecules displace the air molecules, reducing the overall density.