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VAPOUR 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.

vapour density = mass of n molecules of gas / mass of n molecules of hydrogen.

Therefore:

vapour density = molar mass of gas / molar mass of H2

vapour density = molar mass of gas / 2.016

vapour density = ~½ × molar mass

(and thus: molar mass = ~2 × vapour density) For example, vapour density of mixture of NO2 and N2O4 is 38. 3.