Relative-humidity definition

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.
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The amount of moisture in the air as compared with the maximum amount that the air could contain at the same temperature, expressed as a percentage.
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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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The ratio of the actual amount of water vapor (absolute humidity) present in the air to the saturation point at the same temperature, usually expressed as a percentage.
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Other Word Forms

Noun

Singular:
relative-humidity
Plural:
relative humidities