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If moist air repeatedly touches a cold surface, which local phenomenon is more likely?

Answer and explanation

Correct answer: A misty deposit formed by condensation

Answer: C. When moist air comes into contact with a cold surface, the air immediately next to that surface loses heat. Its temperature may fall to the dew point, at which the air becomes saturated. Excess water vapour then condenses into tiny droplets on the surface or in the nearby air, producing a misty deposit or visible fogging. A familiar example is a cool glass becoming misty when exposed to humid air. C is correct because it describes a local condensation effect. A is wrong because a dry, hot wind is associated with heating and drying, not cooling and condensation. B is unrelated to atmospheric moisture. D is caused mainly by gravitational interactions and does not result from air touching a cold surface. The exact visible form may be droplets on the surface or mist nearby, depending on conditions. Memory cue: cold surface plus moist air can bring air to the dew point.

Related tags

Cold SurfaceCondensationDew PointHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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