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If actual vapour pressure is 15 and relative humidity is 75%, what will the saturation vapour pressure be?

Answer and explanation

Correct answer: 20

Correct answer: A, 20. Relative humidity is defined as RH = (actual vapour pressure / saturation vapour pressure) × 100. Let actual vapour pressure e = 15 and RH = 75%. Rearranging gives saturation vapour pressure, e_s = (e × 100) / RH = (15 × 100) / 75 = 1500/75 = 20. Thus the air currently contains vapour pressure equal to 75% of the saturation value. B simply repeats the actual pressure and ignores the formula. C is the percentage, not the requested pressure. D results from an incorrect operation. Memory cue: to find the saturation value, multiply actual pressure by 100 and divide by RH.

Related tags

Relative HumidityNumericalSaturation Vapour PressureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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