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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


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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Compare Meanings

How does relative humidity compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

Even so, the EPA developed a correction formula for PurpleAir monitor readings that accounts for relative humidity, among other factors.

It could feel slightly muggy, too, with dewpoints in the 50s and higher relative humidity above 80 percent at times.

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.

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.

The rise in indoor temperature raises the amount of water the air could hold, but the moisture level remains constant, lowering the relative humidity.

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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relative frequencyrelative impediment