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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.
Answer Wiki. No, the density of a gas is not constant. Since the gas molecules occupy the entire volume of the vessel they are confined in, there is no sense in arbitrarily defining the density of a gas. To overcome this, the density/volume of a gas is always quoted at a specific Pressure (P) and Temperature (T).