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If water vapour directly deposits as ice crystals on a very cold surface which form does it explain?

Answer and explanation

Correct answer: Frost

Correct answer: B, frost. Direct deposition is a phase change in which water vapour changes directly into solid ice without first becoming liquid water. On a very cold surface, this process produces delicate ice crystals or a white frozen coating called frost. Dew is different: vapour condenses into liquid droplets when the surface is cool but above freezing. Mist and fog are collections of tiny liquid droplets suspended in air, so neither is a direct ice deposit on a surface. Therefore A fails because it describes liquid condensation, while C and D fail because they describe suspended air moisture. The key clue is the combination of “directly” and “ice crystals.” Memory cue: vapour to liquid on a cool surface is dew; vapour directly to ice on a very cold surface is frost.

Related tags

FrostDepositionIce CrystalsCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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