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Compared with dew which additional condition is necessary for frost formation?

Answer and explanation

Correct answer: Surface temperature being below freezing point

Direct answer: A. Dew is liquid water deposited on a cool surface when moist air reaches saturation. Frost is also a result of near-surface moisture under cooling, but the deposited water is solid ice. Therefore, compared with ordinary dew, frost needs sufficiently low temperature, with the surface below the freezing point so that ice crystals can form. B is the opposite of the required condition: heating discourages this type of deposition. C is wrong because completely dry air provides little or no water vapour for frost. D concerns the sea and has no necessary role in frost formation on land. Do not confuse the two: dew is liquid and frost is icy. Memory cue: dew equals drops; frost equals frozen crystals.

Related tags

FrostDewFreezing PointIce CrystalsForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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