Vapor density Meaning, Definition & Usage
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noun the density of a gas relative to the density of hydrogen
vapour density.
WordNet
Definitions
(Chem.) , the relative weight of gases and vapors as compared with some specific standard, usually hydrogen, but sometimes air. The vapor density of gases and vaporizable substances as compared with hydrogen, when multiplied by two, or when compared with air and multiplied by 28.8, gives the molecular weight.