Definitions for vapour density
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Princeton's WordNet
vapor density, vapour density(noun)
the density of a gas relative to the density of hydrogen
Wiktionary
vapour density(Noun)
The ratio of the density of a gas to the density of hydrogen at the same temperature and pressure.
Citation
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"vapour density." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/vapour density>.

