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Why may rainfall not occur immediately even when air has RH = 100%?

Answer and explanation

Correct answer: Because droplet growth and uplift are still needed after saturation

Answer: A. Relative humidity of 100% means that air is saturated at its current temperature; it does not automatically mean that rain is falling. For rainfall, condensation must first produce cloud droplets or ice particles, and these particles must grow large enough to overcome air resistance and fall. Growth can occur through collision and coalescence among droplets or through ice-crystal processes in suitable clouds. The cloud may also be shallow, contain too little liquid water, or lack sufficient vertical development. A is correct because saturation is only a condition that permits condensation, while precipitation requires further growth and suitable cloud dynamics. B is wrong because 100% RH means saturation, not dryness. C is wrong because clouds can form at saturation. D is wrong because water vapour is the source of cloud water and precipitation. Memory cue: saturation may start clouds; it does not guarantee rain.

Related tags

Relative HumidityRainfallSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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