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relative humidity
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. : RH, rh
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 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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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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