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Why does body temperature regulation become difficult in sultry weather?

Answer and explanation

Correct answer: Because evaporation of sweat becomes slow

Answer: A. The body loses heat partly by producing sweat and allowing it to evaporate from the skin. Evaporation removes energy from the skin and provides cooling. Sultry weather has high relative humidity, meaning the air already contains a large amount of water vapour and has less capacity to accept additional vapour. Sweat therefore evaporates slowly, even if it remains visible on the skin, so less heat is removed and body cooling becomes difficult. B is wrong because sweat does not instantly freeze in sultry weather. C is wrong because humid air contains substantial water vapour; the problem is too much, not none. D is wrong because body cooling difficulty is primarily linked to evaporation, not the Sun suddenly stopping. Memory cue: sweating cools only when sweat evaporates; humidity makes evaporation harder.

Related tags

GeographySultry WeatherSweat EvaporationHumidityBody CoolingEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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