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Direct change of water vapour into ice crystals is an example of which process?

Answer and explanation

Correct answer: Deposition

Answer: B. Deposition is the direct change of a gas into a solid without passing through the liquid state. In this case, water vapour becomes ice crystals directly. This can occur under suitable cold conditions and contributes to the formation of frost or ice particles in clouds. A, melting, is the reverse change from solid to liquid. C, evaporation, changes liquid water into gas, so it begins with liquid rather than vapour and does not produce ice. D, boiling, is rapid vaporisation of a liquid at its boiling point and is unrelated to direct ice formation. Do not confuse deposition with freezing: freezing changes liquid water into solid ice, whereas deposition changes vapour directly into solid. Memory cue: gas to solid is deposition; solid to gas is sublimation.

Related tags

GeographyDepositionIce CrystalsFrostPhase ChangeHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The Atmosphere

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