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If actual vapour pressure and saturation vapour pressure are equal what will relative humidity be?

Answer and explanation

Correct answer: 100%

Correct answer: A, 100%. Relative humidity compares the actual amount of water vapour in the air with the maximum amount the air can hold at the same temperature. In vapour-pressure form, relative humidity equals actual vapour pressure divided by saturation vapour pressure, multiplied by 100: RH = (e / es) × 100. Here e and es are equal, so e / es = 1. Therefore RH = 1 × 100 = 100%. This means the air is saturated: it is holding as much water vapour as it can hold at that temperature. It does not necessarily mean that rain is falling; condensation may begin if suitable cooling or condensation nuclei are present. B would result if actual vapour pressure were half the saturation value. C would mean no actual water vapour, while D would mean actual vapour pressure was only one-tenth of the saturation value. Thus A is the only mathematically and physically correct choice. Memory cue: actual equals possible maximum means 100% relative humidity.

Related tags

GeographyRelative HumidityVapour PressureAtmospheric MoistureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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