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If the same car roof has a white icy layer and the surface is below (0°C), what will it be?

Answer and explanation

Correct answer: Frost

Correct answer: A, frost. When an exposed surface such as a car roof cools below the freezing point, water vapour can change into ice crystals on that surface. Depending on the exact temperature and moisture conditions, vapour may deposit directly as ice, or a very thin liquid layer may freeze; in either case the visible white icy coating is called frost. A is correct because the clues are a solid icy layer and a sub-freezing surface. B is wrong because dew is made of liquid droplets and is normally associated with temperatures above freezing. C is wrong because mist is made of suspended droplets in air, not a white layer attached to a roof. D is wrong because evaporation is the change of liquid water into vapour, the opposite direction from the surface ice deposit described here. Memory cue: frost is frozen surface condensation; dew is liquid surface condensation.

Related tags

FrostIcy LayerFreezing TemperatureForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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