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Dew and frost may have the same water vapour source yet why is their final form different?

Answer and explanation

Correct answer: Surface temperature above or below freezing changes the state

The correct answer is A: the final form depends mainly on the temperature of the receiving surface. In both cases, water vapour may come from the same atmosphere or nearby moisture source. If a surface cools to its dew point while remaining above freezing, vapour condenses as liquid droplets called dew. If the surface is at or below freezing, water may deposit or freeze as solid ice crystals, producing frost. Thus, the source can be the same but the thermal condition changes the phase of the deposited water. B is wrong because water vapour is not divided into two special types for dew and frost. C is wrong because dew still requires atmospheric moisture. D is wrong because dust may provide a surface or nucleus, but it is not the substance that forms frost. Memory cue: same moisture, different surface temperature, different state.

Related tags

DewFrostSurface TemperatureStateForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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