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

Answer and explanation

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

Correct answer: B. Dew and frost both form when moist air cools and water vapour changes into a deposit on a cool surface. The deciding factor is the temperature of that surface. If it remains above 0°C, the condensed water is liquid and appears as dew drops. If the surface is at or below the freezing point, the deposited moisture forms ice crystals or freezes as frost. A is wrong because water vapour is colourless; colour does not determine the form. C is wrong because dew directly involves water vapour and condensation. D is wrong because dust may provide a surface or nucleus, but frost is not made only from dust. Memory cue: dew is liquid, frost is frozen; check the surface temperature.

Related tags

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

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