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During frost formation, water vapour can directly change into what?

Answer and explanation

Correct answer: Ice crystals

Answer: D. Frost forms when water vapour changes directly into solid ice crystals on a surface whose temperature is at or below freezing. This direct gas-to-solid change is called deposition. It is different from ordinary dew formation, in which water vapour first becomes liquid water droplets through condensation. A is wrong because a river is a large flowing body of liquid water, not a microscopic phase-change product. B is wrong because a sea wave is unrelated to atmospheric deposition. C is wrong because hot smoke is neither water nor a solid form produced by frost. The key sequence is water vapour → ice crystals, without a liquid stage. Memory cue: frost is “dew made of ice,” but scientifically its direct change can be gas to solid.

Related tags

FrostIce CrystalsDepositionPhase ChangeForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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