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When water vapour turns directly into ice crystals, what is the process called?

Answer and explanation

Correct answer: Deposition

Correct answer: B, deposition. A phase change is identified by comparing the starting and ending states. Here water starts as a gas, water vapour, and ends as a solid, ice crystals, without first becoming liquid. The direct gas-to-solid change is called deposition. Frost can form through this process when water vapour changes directly into ice on a sufficiently cold surface. A, evaporation, is liquid to gas. C, melting, is solid to liquid. D, condensation, is gas to liquid, such as vapour becoming liquid droplets. Condensation and deposition are therefore different even though both begin with water vapour. Memory cue: deposition is gas to solid; sublimation is the reverse, solid to gas.

Related tags

DepositionPhase ChangeWater VapourIce CrystalsHydrological CycleThe Living WorldBiologyClass 11 Mcq

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