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If water vapour remains the same and temperature rises, what happens to relative humidity?

Answer and explanation

Correct answer: It decreases

Correct answer: B. Relative humidity compares the actual water vapour in the air with the maximum water vapour that the air could hold at that temperature. When temperature rises, the capacity of air to hold water vapour increases. If no additional vapour is added, the actual amount remains unchanged while the possible maximum becomes larger. Therefore, the ratio becomes smaller and relative humidity decreases. A is wrong because warming alone does not add moisture; it increases the holding capacity. C is wrong because saturation at 100 percent occurs only when the actual vapour amount reaches the capacity at that temperature. D is wrong because the existing water vapour does not suddenly disappear. A useful memory cue is: warm air has a larger “container” for vapour, so the same amount fills a smaller percentage of it.

Related tags

GeographyRelative HumidityTemperatureWater VapourHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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