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In which condition will evaporation of sweat be slowest?

Answer and explanation

Correct answer: High relative humidity and calm air

Direct answer: A. Sweat cools the body only when it evaporates from the skin. High relative humidity means the surrounding air is already close to its moisture capacity, so it accepts additional vapour slowly. Calm air also leaves the moist layer next to the skin in place, reducing air exchange. Therefore evaporation is slowest and the body may feel sticky or sultry. B is wrong because dry air and strong wind remove moisture efficiently. C is wrong because high temperature supplies energy and dry air provides strong capacity for vapour, so evaporation is generally faster. D may be slowed by low temperature, but strong dry wind promotes evaporation; A combines the strongest limiting conditions. Memory cue: humid plus still air means sweat stays on the skin.

Related tags

GeographySweatHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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