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If air in a closed container is already saturated, why will adding more water immediately limit evaporation?

Answer and explanation

Correct answer: Because air has lost capacity to accept additional vapour

Correct answer: A. Saturated air already contains approximately the maximum water vapour possible at its current temperature. In a closed container, adding a larger liquid-water surface does not create unlimited room for more vapour. Molecules can still leave the liquid surface, but vapour molecules also return to the liquid through condensation. As saturation is approached, the rates of evaporation and condensation can become nearly equal, so there is little or no net increase in vapour. Option B is wrong because water temperature does not become infinite. Option C is wrong because water vapour can exist in a closed container; in fact, saturation is established there. Option D is wrong because saturation directly controls the net balance between evaporation and condensation. If the air is warmed or vapour is removed, additional evaporation can occur. Memory cue: saturation means no significant net gain of vapour at that temperature.

Related tags

Saturated AirClosed ContainerEvaporationCondensationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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