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What does absence of rainfall even at 100 percent relative humidity show?

Answer and explanation

Correct answer: Saturation is not a sufficient condition for rainfall

Direct answer: A, saturation is not by itself a sufficient condition for rainfall. Relative humidity of 100 percent means that, at the given temperature, the air contains as much water vapour as it can hold, or is effectively saturated. However, rainfall requires additional steps. Water vapour must condense into droplets or ice particles, and these particles must grow large and heavy enough to overcome upward air movements and fall to the ground. Tiny suspended droplets may form a cloud or mist but remain floating. Thus, saturation indicates a favourable moisture condition, not guaranteed rain. A is correct. B is wrong because 100 percent relative humidity implies substantial water vapour. C is wrong because condensation may occur without producing falling rain. D is wrong because temperature controls saturation and cooling, so it is important. Memory cue: humidity describes the moisture state of air; precipitation describes moisture that has grown and fallen.

Related tags

Relative HumidityPrecipitationSaturationCondensationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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