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If the air is very dry, how will sweat evaporation be?

Answer and explanation

Correct answer: Fast

Direct answer: D, fast. Evaporation is the change of liquid water into water vapour. Very dry air contains relatively little water vapour, so it has a greater capacity to receive additional vapour from the wet surface of the skin. Sweat therefore evaporates more readily. Evaporation requires energy, which is taken from the skin and produces a cooling effect. A is incorrect because slow evaporation is more typical when the air is already humid, although wind, temperature and exposed surface area also matter. B and C are incorrect because dry air does not stop evaporation; it generally encourages it. The body may feel cooler even though the sweat disappears quickly. Memory cue: dry air accepts vapour; humid air resists further evaporation. This describes the usual effect when other conditions are comparable.

Related tags

GeographySweatEvaporationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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