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

Answer and explanation

Correct answer: Warm water supplies moisture and cold air becomes saturated quickly

Correct answer: B. A warm lake has a surface from which liquid water evaporates, adding water vapour to the air immediately above it. Cold air can hold less water vapour than warm air. Therefore, as the cold air receives moisture from the warm lake, it may reach saturation quickly. Some of the added vapour then condenses into very small droplets, producing a visible, steam-like mist above the water. The visible mist is not necessarily hot steam; it is mainly condensed liquid water suspended in cooler air. A is wrong because cold air can contain water vapour, although its capacity is lower. C is physically meaningless. D is wrong because dust may provide condensation nuclei, but moisture and cooling are the essential conditions in this example. Memory cue: warm water supplies vapour; cold air cannot hold it all, so droplets appear.

Related tags

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

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