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If air in a closed vessel becomes saturated, why is net evaporation from the water surface limited?

Answer and explanation

Correct answer: Because evaporation and condensation may nearly balance

Correct answer: A. Evaporation is the escape of water molecules from the liquid surface into the air, while condensation is the return of vapour molecules to the liquid. In a closed vessel, water vapour cannot continually disperse into an unlimited surrounding atmosphere. As the air approaches saturation, the rate of condensation back to the surface can become nearly equal to the rate of evaporation. Individual molecules may still move in both directions, but the net gain of vapour becomes very small. A is correct because it describes dynamic equilibrium. B is wrong because water can become vapour. C is wrong because air has temperature. D is wrong because saturated air contains molecules; it contains as much vapour as conditions allow. Memory cue: saturation limits net change, not molecular motion.

Related tags

Closed SystemSaturationNet EvaporationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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