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Why is it wrong to treat relative humidity as the same as rainfall probability?

Answer and explanation

Correct answer: Because relative humidity only shows closeness to saturation

Correct answer: A. Relative humidity is the amount of water vapour in air compared with the maximum amount that air could hold at the same temperature, expressed as a percentage. It tells us how close the air is to saturation, not whether rain must occur. Rainfall usually requires additional processes: air must rise and cool, condensation must form cloud droplets or ice particles, and those particles must grow large enough to fall. Atmospheric stability, cloud structure, lifting, temperature, and wind also matter. B is false because rainfall begins with water vapour. C confuses a humidity percentage with a probability percentage. D is false because relative humidity changes strongly with temperature. Memory cue: “RH describes moisture state; rain probability predicts an event.”

Related tags

Relative HumidityRain ProbabilityPrecipitationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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