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Why is cooling of air to the dew point important for fog formation?

Answer and explanation

Correct answer: Only then can water vapour condense into tiny droplets

Direct answer: A is correct. The dew point is the temperature at which air becomes saturated with its existing water vapour, assuming the pressure and moisture content are considered in the usual way. As air cools to this temperature, relative humidity reaches about 100 percent, and excess vapour can condense on tiny particles into microscopic liquid droplets. When these droplets remain suspended close to the ground, fog forms. A correctly describes this process. B is wrong because air becomes saturated, not completely dry. C is impossible because vapour does not turn into stone. D is wrong because air pressure does not disappear at the dew point. Memory cue: reach dew point, reach saturation, then droplets can appear.

Related tags

FogDew PointSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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