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Why can steam-like mist appear when cold air moves over a warm lake?

Answer and explanation

Correct answer: Warm water supplies moisture and cold air saturates quickly

Correct answer: A. Warm lake water evaporates and adds water vapour to the colder air immediately above it. Cold air can hold less water vapour than warm air, so the added moisture can quickly bring that air close to saturation or beyond it. The excess vapour condenses into tiny droplets, which scatter light and look like steam or mist above the lake. A correctly states both the moisture source and the rapid saturation. B is wrong because cold air does not have infinite vapour capacity; its capacity is generally lower than that of warm air. C is wrong because a lake does not turn vapour into soil. D is wrong because mist is made mainly of tiny water droplets, although particles can help droplets form. The visible “steam” is not usually gaseous water vapour itself; it is condensed liquid water. Memory cue: warm water supplies moisture, cold air cannot hold it all, and mist appears.

Related tags

MistWarm LakeCold AirEvaporationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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