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What is the approximate average residence time of water in the atmosphere?

Answer and explanation

Correct answer: About 9 days

The correct answer is A: about 9 days. Residence time means the average period that a substance remains in one part of a cycle before moving elsewhere. Water continuously enters the atmosphere through evaporation from water bodies and transpiration from plants. It then leaves the atmosphere mainly through condensation and precipitation. Because atmospheric water vapour is continually replaced and usually returns as rain or snow in a relatively short period, its average residence time is approximately nine days. A is correct because it gives the accepted approximate value. B is wrong because nine years is far too long for the average atmospheric storage of water. C is wrong because one hundred days greatly overestimates the usual period. D is wrong because one hour is much too short. Memory cue: atmospheric water is short-lived compared with water stored in oceans or ice.

Related tags

Residence-TimeAtmosphereHydrological-CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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