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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 Humidity indicates how moist the air is. Relative humidity may be defined as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density, usually expressed in percent: Relative Humidity (RH) = (Actual Vapor Density) -------------------- (Saturation Vapor Density) X 100%.elative Humidity indicates how moist the air is. Relative humidity may be defined as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density, usually expressed in percent: Relative Humidity (RH) = (Actual Vapor Density) -------------------- (Saturation Vapor Density) X 100%.