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When dew point is below freezing, direct change of water vapour to ice promotes which form?

Answer and explanation

Correct answer: Frost

Correct answer: A, frost. The dew point is the temperature at which air becomes saturated with respect to water vapour. If that temperature is below 0°C and a surface cools to or below it, the vapour can change directly into ice crystals on the surface; this gas-to-solid change is called deposition. The resulting white or icy surface coating is frost. A is correct because frost is the frozen surface form produced under subfreezing conditions. B is wrong because liquid dew requires liquid droplets and is favoured when the surface temperature is above freezing. C is wrong because mist is made of suspended droplets in air and is not defined by direct vapour-to-ice deposition on a surface. D is wrong because sea evaporation is a liquid-to-gas process and is unrelated to this surface deposit. Memory cue: below-freezing dew point plus direct vapour-to-ice change = frost.

Related tags

FrostDew PointDepositionForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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