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If saturation vapour pressure increases while actual vapour pressure remains the same, what happens to relative humidity?

Answer and explanation

Correct answer: It will decrease

Correct answer: B, it will decrease. Relative humidity tells us how much water vapour is actually present compared with the maximum vapour the air can hold at that temperature. The relationship is: relative humidity = actual vapour pressure ÷ saturation vapour pressure × 100. Here, the actual vapour pressure stays unchanged, while the saturation vapour pressure, which is the denominator, becomes larger. Therefore the ratio becomes smaller and relative humidity decreases. For example, if actual vapour pressure is 10 units and saturation vapour pressure rises from 20 to 25 units, humidity falls from 50% to 40%. A is wrong because the numerator has not increased. C is wrong because relative humidity cannot become negative. D is wrong because 100% occurs only when actual and saturation vapour pressures are equal. Memory cue: same actual moisture plus greater holding capacity means lower relative humidity.

Related tags

GeographyRelative HumidityVapour PressureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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