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What happens to heat during evaporation?

Answer and explanation

Correct answer: Heat is absorbed

Correct answer: A, heat is absorbed. During evaporation, some water molecules at the surface gain enough energy to escape from the liquid and become water vapour. This energy is taken from the water and its surroundings as latent heat. Since the faster, more energetic molecules leave first, the remaining surface can become cooler; this explains cooling from sweat and a wet cloth. Heat is not destroyed, so B is wrong. It does not always double, so C is wrong. Heat is directly involved in changing liquid water into vapour, so D is wrong. Memory cue: evaporation takes heat in; condensation gives latent heat out.

Related tags

GeographyEvaporationLatent HeatCoolingHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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