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Why is rainfall not compulsory even when relative humidity is 100%?

Answer and explanation

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

Direct answer: A is correct. Relative humidity of 100% means that the air is saturated at its present temperature; it does not by itself mean that raindrops have already become large enough to fall. For rainfall, water vapour must condense onto suitable nuclei or existing cloud droplets, and the droplets or ice particles must grow through collision, coalescence, or other cloud processes. They also need sufficient size and downward motion to reach the ground without evaporating. Rising air and cooling can help cloud development, but saturation alone is not a guarantee of measurable rain. A is correct because it includes the need for droplet growth and suitable atmospheric motion. B is wrong: 100% relative humidity means the air is holding the maximum vapour possible at that temperature, not zero vapour. C is wrong because dry air does not provide the basic moisture needed for rain. D is wrong because saturated air can form clouds. Memory cue: saturation is necessary in many cases, but saturation is not the same as precipitation.

Related tags

SaturationRainfallRelative HumidityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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