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Why is the evaporation rate generally low when relative humidity is 90%, compared with otherwise similar conditions at lower humidity?

Answer and explanation

Correct answer: Because the air is close to saturation

Correct answer: A. At 90% relative humidity, the air is already close to the amount of water vapour it can hold at that temperature. The difference in water-vapour pressure between the wet surface and the air is therefore relatively small, so evaporation is generally slower than in drier air. Temperature, wind, and surface conditions also affect the rate.

Related tags

Relative HumidityEvaporationHumidityAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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