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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.
Gas pressure, temperature and density relation. The density is the mass of substance per unit of volume. where is: Ï - density; m - mass; V - volume. The unit of density is kilogram per cubic meter [kg/m3] in SI system of units and used symbol is Ï .