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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.
1. (General Physics) the ratio of the density of a gas or vapour to that of hydrogen at the same temperature and pressure.oun. 1. vapour density-the density of a gas relative to the density of hydrogen. vapor density. relative density-the ratio of the density of something to the density of a standard.