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Why can dew on a surface and light mist in air form together?

Answer and explanation

Correct answer: Both surface and lower air cool with moisture present

Direct answer: C is correct. Dew and mist are produced by the same broad process—cooling of moist air—but the location of the condensed water differs. When the ground or another exposed surface cools to the dew point, water collects as droplets on that surface and is called dew. At the same time, if the air close to the ground also cools to saturation, tiny droplets remain suspended in the air and form mist. Thus both can occur during a calm, moist, cool night. A is wrong because completely dry air cannot provide the vapour needed for either formation. B is wrong because condensation requires water vapour before it changes into droplets. D is unrelated; an earthquake is not the normal cause of dew or mist. The important distinction is location: dew is on a surface, while mist is suspended in nearby air. Memory cue: same cooling, different place.

Related tags

DewMistCondensationMoist AirForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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