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During frost formation, water vapour changes into which state?

Answer and explanation

Correct answer: Solid

Correct answer: A, solid. Frost forms when moist air or water vapour comes in contact with a surface that has cooled below the freezing point. The vapour changes directly into tiny solid ice crystals on grass, leaves, soil, or other exposed surfaces. This direct change from gas to solid is called deposition, although the question mainly asks for the resulting state. A is correct because ice crystals are solid. B is incorrect because liquid water droplets on a cool surface are called dew, not frost. C is incorrect because plasma is an extremely energetic state of matter and is unrelated to ordinary frost. D is incorrect because lava is molten rock, not a state into which water vapour changes. Memory cue: dew means liquid droplets; frost means solid ice crystals.

Related tags

FrostSolid StateWater VapourCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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