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If moist air flows over cold land and fog forms, what is the correct sequence?

Answer and explanation

Correct answer: Contact cooling, then dew point, then condensation

Direct answer: A, contact cooling, then reaching the dew point, then condensation. Moist air flowing across a colder land surface loses heat through contact with that surface. As its temperature falls, the air may reach its dew point, the temperature at which it becomes saturated. If cooling continues or saturation is maintained, some water vapour changes into very small liquid droplets. These droplets remain suspended near the ground and produce fog. A correctly presents the causal order: the cold surface causes cooling, cooling brings the air to the dew point, and saturation allows condensation. B is wrong because the process does not require dryness, and frost needs temperatures at or below freezing. C is wrong because boiling is not involved in ordinary fog formation. D is wrong because zero air pressure is neither necessary nor a realistic explanation. Memory cue: surface cooling leads to dew point, and dew point permits condensation.

Related tags

Contact CoolingFogDew PointCondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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