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Why can relative humidity increase during evening?

Answer and explanation

Correct answer: Falling temperature reduces air capacity

Correct answer: A, falling temperature reduces the air’s moisture-holding capacity. Relative humidity compares the actual amount of water vapour in air with the maximum amount the air could hold at that temperature. During evening, temperature often falls while the actual water vapour may remain nearly the same for a time. Because cooler air has a lower saturation capacity, the same moisture becomes a larger percentage of that capacity, so relative humidity rises. B is incorrect because evening cooling, not a guaranteed temperature rise, is the relevant idea. C would generally reduce humidity, not increase it. D does not directly determine relative humidity and is not a universal evening event. If cooling continues to the dew point, condensation may begin. Memory cue: same moisture plus cooler air means higher relative humidity.

Related tags

GeographyRelative HumidityEveningHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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