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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.
The vapor pressure of the solution is found by subtracting the vapor pressure change of the pure solvent from the vapor pressure of the pure solvent. Vapor pressure is an important physical property of volatile liquids. The vapor pressure of a pure liquid is lowered by the addition of a nonvolatile solute.The vapor pressure of a liquid is the pressure exerted by its vapor at the liquid gas interface when the liquid and vapor are at equilibrium.A high vapor pressure indicates a volatile liquid.he vapor pressure of the solution is found by subtracting the vapor pressure change of the pure solvent from the vapor pressure of the pure solvent. Vapor pressure is an important physical property of volatile liquids. The vapor pressure of a pure liquid is lowered by the addition of a nonvolatile solute.