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If actual water vapour content remains the same but temperature rises, why does relative humidity generally decrease?

Answer and explanation

Correct answer: Because warm air has a higher saturation capacity

The correct answer is A. Relative humidity compares the actual amount of water vapour in air with the maximum amount that air could hold at the same temperature. When temperature rises, the saturation capacity of air generally increases. If the actual vapour content does not change, the numerator of this comparison stays the same while the possible maximum becomes larger; therefore the percentage, or relative humidity, falls. B is wrong because warmer conditions do not make water vapour immediately freeze. C is wrong because air pressure does not always become zero when temperature rises. D is wrong because evaporation does not completely stop; in many situations it can increase. Do not confuse actual humidity with relative humidity: actual humidity describes the vapour present, whereas relative humidity also depends strongly on temperature. Memory cue: same moisture plus warmer air means a larger moisture capacity and a lower relative percentage.

Related tags

GeographyRelative HumidityTemperatureSaturation CapacityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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