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When does the chance of dew-like moisture turning into frost increase?

Answer and explanation

Correct answer: When the surface temperature falls below the freezing point

Answer: A. Dew is liquid water that forms when moist air near a surface cools to its dew point. Frost is different because the deposited water is frozen or water vapour changes directly into ice crystals on a surface. Therefore, the decisive condition is that the surface temperature falls below 0°C, the usual freezing point of water. Option A is correct because liquid dew can freeze, or vapour can deposit as ice, when the surface is below freezing. Option B is wrong because strong afternoon heating generally raises temperature and encourages evaporation rather than frost formation. Option C is wrong because completely dry air supplies too little moisture for dew or frost. Option D is wrong because frost must form on a surface such as grass, leaves, soil, or a roof. Memory cue: dew is liquid on a cool surface; frost is ice on a freezing surface.

Related tags

DewFrostFreezing SurfaceForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeographyClass 12 Mcq

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