relative humidity

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noun

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. Abbreviations: RH, rh

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Also called humidity.

Compare absolute humidity, dew point, mixing ratio, specific humidity.

Origin of relative humidity

First recorded in 1810–20

Words nearby relative humidity

relative clause, relative complement, relative density, relative deprivation, relative frequency, relative humidity, relative impediment, relative leukocytosis, relatively, relatively prime numbers, relative major

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for relative humidity

The rise in indoor temperature raises the amount of water the air could hold, but the moisture level remains constant, lowering the relative humidity.
Winter will make the pandemic worse. Here’s what you need to know.|David Rotman|October 8, 2020|MIT Technology Review
That’s bad news for most of the US, where relative humidity routinely drops as low as 15% on the coldest days, compared with typical indoor relative humidity of 50% to 70% in the summer.
Winter will make the pandemic worse. Here’s what you need to know.|David Rotman|October 8, 2020|MIT Technology Review
The most likely culprit is the big drop in relative humidity—the amount of water in a given volume of air compared with the maximum it could hold at that temperature—when already-dry cold outside air enters a home and is heated.
Winter will make the pandemic worse. Here’s what you need to know.|David Rotman|October 8, 2020|MIT Technology Review
But relative to centuries past, America is a marvel of domestic tranquility.
No Gods, No Cops, No Masters|James Poulos|January 1, 2015|DAILY BEAST

Parents who want to transfer custody of a child to someone other than a relative must seek permission from a judge.
Judge: Rehoming Kids Is Trafficking|Tina Traster|December 30, 2014|DAILY BEAST
While traveling this holiday season, a relative and I were pulled over by a police officer.
Obama Is Right on Race. The Media Is Wrong.|Keli Goff|December 29, 2014|DAILY BEAST
Of course, this is The Comeback, and so "success" is a relative word.
‘The Comeback’ Finale: Give Lisa Kudrow All of the Awards|Kevin Fallon|December 29, 2014|DAILY BEAST
Her son peeked out the window and told me his mother had left Havana for La Lisa to visit a dying relative.
The Life and Hard Times Of The Family A Cuban Defector Left Behind|Brin-Jonathan Butler|December 19, 2014|DAILY BEAST
But I suppose, as he is my nearest relative, it is but natural he should be anxious about my health.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
This had been quite genuine, for the Professor had been fond of his relative, who had always been very good to him.
Uncanny Tales|Various
The relative quantity of labor embodied in each object is the basis of its value.
The Unsolved Riddle of Social Justice|Stephen Leacock
It is evident that an absolute increase of any variety may be accompanied by a relative decrease.
A Manual of Clinical Diagnosis|James Campbell Todd
An increase in actual number is an absolute increase; an increase in percentage only, a relative increase.
A Manual of Clinical Diagnosis|James Campbell Todd

British Dictionary definitions for relative humidity

relative humidity

noun

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 temperatureCompare 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

Medical definitions for relative humidity

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.

Scientific definitions for relative humidity

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.

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relative humidity

noun

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Origin of relative humidity

Words nearby relative humidity

Example sentences from the Web for relative humidity

British Dictionary definitions for relative humidity

noun

Medical definitions for relative humidity

n.

Scientific definitions for relative humidity