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relative humidity

noun

  1. the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature; the ratio of the actual water vapor pressure to the saturation vapor pressure. : RH, rh


relative humidity

noun

  1. the mass of water vapour present in the air expressed as a percentage of the mass that would be present in an equal volume of saturated air at the same temperature Compare absolute humidity
“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


relative humidity

  1. The ratio of the actual amount of water vapor present in a volume of air at a given temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage. Warm air can hold more water vapor than cool air, so a particular amount of water vapor will yield a lower relative humidity in warm air than it does in cool air.


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Word History and Origins

Origin of relative humidity1

First recorded in 1810–20
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Example Sentences

These conditions may be a high wind, low relative humidity, high temperatures, or a combination of the three.

They were the entranced William and Miss Pratt; and their appearance offered a suggestive contrast in relative humidity.

This cellar should have a temperature of 58° to 64° F. and a relative humidity of 95 per cent of saturation.

Further draining is best accomplished in a room at about 64° F. with a relative humidity of 85 to 90 per cent.

The cellars are wet, since they reach 90 to 95 per cent relative humidity at a temperature of about 55° F.

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