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If evaporation is rapid and air is continuously removed, why can surface cooling increase?

Answer and explanation

Correct answer: Because evaporation takes latent heat and cools the surface

Answer: A. During evaporation, faster molecules leave the liquid surface. To change liquid water into vapour, latent heat is required. That energy is taken from the water and nearby surface, so the average energy and temperature of the remaining surface can fall. If air is continuously removed, moist air is replaced by drier air. This maintains a strong humidity gradient and allows evaporation to continue rapidly, so cooling can become greater. A correctly connects evaporation, latent heat and surface cooling. B reverses the energy direction: condensation releases latent heat, whereas evaporation absorbs it. C is too absolute; removing air does not itself freeze water. D is wrong because phase changes have clear energy effects. Memory cue: evaporation absorbs heat; condensation releases heat.

Related tags

Latent HeatEvaporationCoolingHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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