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Why is the unsaturation of air important for the rate of evaporation?

Answer and explanation

Correct answer: Because unsaturated air has capacity to accept more water vapour

The correct answer is A. Evaporation is the change of liquid water into vapour at a surface. It is favoured when the air above that surface is unsaturated, because the air can accept additional water vapour. The larger the difference between the moisture actually present and the moisture possible at saturation—the humidity deficit—the stronger the potential for evaporation, assuming suitable energy and airflow. B is wrong because unsaturated air can contain heat; temperature affects evaporation rather than disappearing from the air. C is wrong because unsaturated air does not only form ice. D is wrong because air contains molecules whether it is saturated or unsaturated. Also remember that unsaturation alone is not the only control: temperature, wind, exposed surface, and water supply matter too. Memory cue: evaporation needs a moisture deficit.

Related tags

EvaporationUnsaturated AirHumidity DeficitHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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