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How is the rate of evaporation generally in dry air?

Answer and explanation

Correct answer: Fast

Direct answer: B, fast. Dry air contains relatively little water vapour, so it has more capacity to receive additional vapour from a wet surface. This larger difference between the vapour at the surface and the vapour in the air allows evaporation to proceed more rapidly. A is wrong because slow evaporation is more likely when the air is already humid, all other conditions being similar. C is wrong because dry air does not stop evaporation; it generally encourages it. D is wrong because the rate is not always the same: humidity, temperature, wind, and exposed surface area can change it. B is correct under the usual comparison, assuming other conditions are similar. A wet cloth dries faster in dry air because the surrounding air can accept more water vapour. Memory cue: dry air has ‘space’ for vapour; humid air has less space. Do not interpret this as saying humidity is the only factor.

Related tags

Dry AirEvaporationHumidityWater VapourAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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