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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.
Key Concepts. 1  Since density is a characteristic property of a substance, each liquid has its own characteristic density. 2  The density of a liquid determines whether it will float on or sink in another liquid. 3  A liquid will float if it is less dense than the liquid it is placed in.