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If actual vapour pressure is 12 and saturation vapour pressure is 24, what will be the relative humidity?

Answer and explanation

Correct answer: 50%

Correct answer: B. Relative humidity compares the water vapour actually present with the maximum vapour pressure possible at the same temperature. The formula is: relative humidity = (actual vapour pressure ÷ saturation vapour pressure) × 100. Substituting the given values gives (12 ÷ 24) × 100 = 0.5 × 100 = 50%. A, 25%, would result from using one-fourth of the saturation value, not one-half. B is correct because 12 is exactly half of 24. C, 75%, is not the ratio 12/24. D, 100%, would mean actual vapour pressure equals saturation vapour pressure, which it does not. Memory cue: actual pressure goes in the numerator; saturation pressure goes in the denominator.

Related tags

Relative HumidityVapour PressureNumerical FormulaHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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