RELATIVE HUMIDITY Definition & Meaning

relative humidity

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

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

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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First recorded in 1810–20

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Examples have not been reviewed.

Thick marine-layer clouds filled the sky at 7 a.m, keeping the relative humidity too high for a good scorching.

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The weather service reported wind gusts of 25 to 35 mph with relative humidity at about 10%.

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The air is forecast to be extremely dry, with relative humidities under 10% through Friday.

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The air is expected to be quite dry, with relative humidity as low as 8% in Los Angeles and Ventura counties.

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The air is expected to be quite dry, however, with relative humidity as low as 8% in Los Angeles and Ventura counties.

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