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How will low wind speed and high relative humidity together affect evaporation?

Answer and explanation

Correct answer: Evaporation will slow down

Direct answer: A, evaporation will slow down. Evaporation is favoured when energy is available and when the air above a wet surface can accept and carry away additional water vapour. Wind helps replace moist air near the surface with drier air, so moving air usually supports faster evaporation. High relative humidity means the air is already close to its moisture-holding limit at that temperature, leaving less capacity for new vapour. Low wind speed also allows a moist layer to remain over the surface. Together, these conditions reduce the removal of vapour and therefore reduce the evaporation rate. A is correct. B is wrong because both conditions oppose rapid evaporation. C is wrong because boiling requires a particular temperature and pressure condition, not merely humidity or weak wind. D is wrong because wind and humidity do not make condensation nuclei disappear. Memory cue: still, humid air is poor at accepting new vapour.

Related tags

Wind SpeedRelative HumidityEvaporation RateMoistureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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