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Which form correctly represents the formula of relative humidity?

Answer and explanation

Correct answer: (RH = Actual vapour pressure / Saturation vapour pressure) × 100 / (RH = Actual vapour pressure / Saturation vapour pressure) × 100

Correct answer: A. Relative humidity compares the water vapour actually present in air with the maximum vapour pressure possible at the same temperature, called saturation vapour pressure. The comparison is written as a ratio and multiplied by 100 because relative humidity is expressed as a percentage: RH = (actual vapour pressure ÷ saturation vapour pressure) × 100. If actual and saturation vapour pressures are equal, the air is saturated and RH is 100 percent. B is wrong because wind speed is not the numerator–denominator comparison that defines humidity. C is wrong because rainfall and temperature are not added to obtain relative humidity. D is wrong because cloud height divided by pressure is not the humidity formula. A common confusion is to omit the ×100 and obtain a decimal ratio instead of a percentage. Remember: actual moisture compared with possible moisture, multiplied by 100.

Related tags

GeographyRelative HumidityFormulaWater Vapour PressureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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