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What does relative humidity express as a percentage?

Answer and explanation

Correct answer: Ratio of actual water vapour to saturation capacity

Answer: A, the ratio of actual water vapour to the saturation capacity of air. Relative humidity compares the moisture actually present with the maximum moisture the air could hold at the same temperature. It is expressed as a percentage: relative humidity = actual water vapour content divided by saturation capacity, multiplied by 100. For example, if air contains half of the vapour it could hold at that temperature, its relative humidity is 50 percent. The comparison must be made at the same temperature because warm and cool air have different holding capacities. A is correct because it states this comparison. B is wrong because wind speed describes motion, not moisture content. C is wrong because rainfall is a form of precipitation and is not the definition of relative humidity. D is wrong because cloud height is a positional measurement. Relative humidity may rise when air cools even if no water is added, since the saturation capacity becomes smaller. Memory cue: relative means actual moisture compared with possible moisture at that temperature.

Related tags

GeographyRelative HumidityHumidityAtmospheric MoistureEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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