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What is the role of latent heat in evaporation?

Answer and explanation

Correct answer: Water absorbs heat and changes into vapour

Answer: B. During evaporation, some liquid-water molecules at the surface gain enough energy to escape into the air as vapour. The energy needed for this change of state is absorbed from the surroundings and is called latent heat of vaporisation. It is called “latent” because the energy changes the state without necessarily raising the temperature while the phase change occurs. Since the surroundings lose energy, evaporation can produce a cooling effect, as with sweating. A describes heat release and freezing, which is the opposite direction. C is not the definition of evaporation. D incorrectly links cloud movement with latent heat. Memory cue: evaporation takes energy; condensation gives energy back.

Related tags

GeographyLatent HeatEvaporationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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