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

Answer and explanation

Correct answer: When surface temperature falls below freezing point

The correct answer is A: the chance increases when the surface temperature falls below the freezing point. Dew is liquid water that forms when moist air cools on a surface. If that surface becomes colder than 0°C, the liquid droplets may freeze. In some conditions, water vapour can also change directly into ice crystals on the cold surface. Therefore, both moisture and a sufficiently cold surface are important. B is wrong because strong afternoon heating raises temperature and usually removes dew rather than freezing it. C is wrong because completely dry air provides too little water vapour for dew or frost. D is wrong because dew and frost form on surfaces. Memory cue: dew is liquid on a surface; frost is frozen water or ice deposited on a surface.

Related tags

DewFrostFreezing SurfaceCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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