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In which condition does sweat dry quickly?

Answer and explanation

Correct answer: In dry and windy air

Direct answer: A, in dry and windy air. Sweat is liquid water on the skin, and it dries mainly through evaporation. Evaporation is faster when the surrounding air is dry because dry air can accept more water vapour. Wind also removes the moist air close to the skin and replaces it with drier air, so more sweat can evaporate. A combines both helpful conditions. B is wrong because very humid air is already rich in vapour and slows further evaporation. C is wrong for the same reason, and a closed room also has little air movement. D is wrong because fog means the air contains tiny suspended water droplets and is generally very moist; it does not provide a good drying condition. This is why moving air can make us feel cooler even when temperature has not changed much. Memory cue: dry air plus moving air means faster evaporation.

Related tags

GeographySweatEvaporationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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