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Why can warm, humid air make the body feel uncomfortable?

Answer and explanation

Correct answer: Sweat evaporates slowly

Correct answer: A, sweat evaporates slowly. The body uses sweating as a cooling mechanism. When sweat changes from liquid to vapour, it takes heat from the skin, producing a cooling effect. Warm humid air already contains a relatively large amount of water vapour, so evaporation from the skin occurs more slowly. As a result, sweat remains on the skin longer and the body loses heat less effectively, making the conditions feel hot and uncomfortable. A is correct. B is wrong because warm humid conditions do not normally freeze sweat. C is the opposite of the situation: humid air contains considerable water vapour. D is wrong because warm air is not necessarily at zero temperature. Memory cue: humidity slows sweat evaporation, and slower evaporation means less cooling.

Related tags

HumiditySweatEvaporationThermal ComfortAtmospheric MoistureAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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