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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.
Abbreviation: RH, rh.
Also called humidity.
Origin of relative humidity
1810-1820
1810-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for relative humidity
Historical Examples
  • How is the relative humidity of the air affected by warming it?

    Physics Willis Eugene Tower
  • On clear days the rapid fall in the relative humidity is astonishing.

  • Thus in Mollendo the relative humidity during the winter of 1895 was 81 per cent; during the summer 78 per cent.

  • For the most healthful conditions the relative humidity should be from 40 per cent.

    Physics Willis Eugene Tower
  • The cloudiness and relative humidity average high on western coasts, with the maximum in the colder season.

  • Most determinations of relative humidity are made with this kind of instrument.

    Physics Willis Eugene Tower
  • It is seen that the relative humidity attains its maximum in winter, in the months of July and August, with a mean of 90 per cent.

  • How may the relative humidity of the air in a home be increased?

    Physics Willis Eugene Tower
  • Gockel found a diminution of ionization with rise of relative humidity.

  • The iodide curve follows closely that of relative humidity, clouds, and rain; the thallium curve stands in no relation to it.

British Dictionary definitions for relative humidity

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
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relative humidity in Medicine

relative humidity n.
The ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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relative humidity in Science
relative humidity  
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. Compare absolute humidity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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