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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.
Popular Terms. Weight of a unit volume of gas or vapor compared to (divided by) the weight of an equal volume of air (or, sometimes, hydrogen). Substances lighter than air (such as acetylene, methane, oxygen) are said to have vapor densities less than 1.0 and substances heavier than air (such as butane, chlorine, ethane) are said to have vapor densities higher than 1.0.