the ratio of the mass of water vapor in air to the total mass of the mixture of air and water vapor.
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British Dictionary definitions for specific humidity
the mass of water vapour in a sample of moist air divided by the mass of the sample
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012