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Why is a large open water surface helpful for evaporation?

Answer and explanation

Correct answer: Because more water molecules can escape from a larger surface

Correct answer: A. Evaporation occurs at the exposed surface of a liquid. At that boundary, some water molecules have enough energy to leave the liquid and enter the air as vapour. A larger open surface provides more exposed area and therefore allows more molecules to escape at the same time, if other conditions such as temperature, humidity and wind are comparable. B is wrong because colour does not explain the available escape area. C is wrong because atmospheric pressure does not become zero over a large water body. D is wrong because wind does not completely stop; in fact, moving air can often remove moist air and support evaporation. A large sea may therefore supply more vapour than a small pond, though the actual rate also depends on temperature and atmospheric conditions. Memory cue: more exposed liquid surface means more opportunities for molecules to escape.

Related tags

GeographyEvaporationSurface AreaHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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