why is the heat of evaporation for a molecule near the surface is lower than a molecule inside the surface
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Why does evaporation cause cooling?
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Rohit Kumar Gupta, I am an undergraduate student at IIT Bombay, pursuing a B.Tech. Degree in engineering physics
Answered Feb 24, 2013
See the explanation from wikipediaEvaporation:
Molecules in a liquid have varying speeds. Some have low speeds and some have high speed. Formolecules of a liquid to evaporate, they must be located near the surface, be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces.[1] When only a small proportion of the molecules meet these criteria, the rate of evaporation is low. Since the kinetic energy of a molecule is proportional to its temperature, evaporation proceeds more quickly at higher temperatures. As the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid decreases. This phenomenon is also called evaporative cooling
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Rohit Kumar Gupta, I am an undergraduate student at IIT Bombay, pursuing a B.Tech. Degree in engineering physics
Answered Feb 24, 2013
See the explanation from wikipediaEvaporation:
Molecules in a liquid have varying speeds. Some have low speeds and some have high speed. Formolecules of a liquid to evaporate, they must be located near the surface, be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces.[1] When only a small proportion of the molecules meet these criteria, the rate of evaporation is low. Since the kinetic energy of a molecule is proportional to its temperature, evaporation proceeds more quickly at higher temperatures. As the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid decreases. This phenomenon is also called evaporative cooling
sonu579:
actually my question does not match with ur ques
I mean ur ans
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rate of evaporation is depend on surface area.if the surface area is increased,the rate of evaporation increases.so in a molecule near surface the area is less then the rate of evaporation is low than inside the surface.
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