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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.
relative density of a substance is defined as the ratio between the density of the substance to the density of water at 40c relative density is also known as specific gravity the relative density of a substance is a pure number without any unit it tells how many times a substance is heavier than water relative density r d of a substance can be calculated by dividing density of a substance with the density of water