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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.
Factors That Affect Vapor Pressure. 1  Surface Area: the surface area of the solid or liquid in contact with the gas has no effect on the vapor pressure. 2  Types of Molecules: the types of molecules that make up a solid or liquid determine its vapor pressure.  relatively strong, the vapor pressure will be relatively low.