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Which form can be made when water vapour directly changes into ice crystals?

Answer and explanation

Correct answer: Frost

Direct answer: C, frost. Frost forms when water vapour changes directly into solid ice crystals on a sufficiently cold surface, without first becoming liquid water. This direct gas-to-solid change is called deposition. The crystals may cover grass, leaves, soil, or other exposed surfaces and give them a white, icy appearance. C is correct because frost is the icy form of surface condensation or deposition. A is wrong because dew consists of liquid water droplets formed when vapour condenses into water, usually on a cool but not freezing surface. B is wrong because mist is made mainly of tiny liquid droplets suspended in air, not a frost coating on a surface. D is wrong because rain is liquid precipitation that falls from clouds; it is not the direct deposition of vapour on a surface. A useful warning is that frost and dew are related by cooling, but frost involves ice while dew involves liquid water. Memory cue: dew is wet water; frost is frozen crystals.

Related tags

FrostIce CrystalsDepositionDewForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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