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If (RH=60%) and (e_s=30), what will (e) be?

Answer and explanation

Correct answer: (18)

Correct answer: A, 18. Relative humidity is defined as the ratio of actual vapour pressure to saturation vapour pressure, multiplied by 100: RH = (e/e_s) × 100. To find actual vapour pressure, rearrange the formula: e = (RH × e_s)/100. Substituting the given values gives e = (60 × 30)/100 = 1800/100 = 18. Therefore, the actual vapour pressure is 18 in the same pressure unit as e_s. B incorrectly copies the saturation value without applying the 60 percent factor. C is an arithmetic or formula error, and D treats the percentage as the answer rather than calculating e. A useful check is that at 60% relative humidity, actual vapour pressure must be 60% of 30, so it must be less than 30; 18 satisfies this check.

Related tags

Relative HumidityVapour PressureNumericalFormulaHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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