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When is frost more likely to form?

Answer and explanation

Correct answer: When the surface temperature is below freezing

Correct answer: B, when the surface temperature is below freezing. Frost is a deposit of ice crystals that forms on a cold surface when water vapour changes directly into ice, or when moisture freezes there. A very cold surface is therefore essential, and the temperature is generally below 0°C at the surface. A hot surface prevents frost because it supplies heat and keeps moisture from freezing. Completely dry air provides no water vapour for frost, although the air need not be perfectly dry for frost to occur. Tides are movements of seawater caused mainly by gravitational effects and do not determine frost formation. Memory cue: dew is liquid moisture on a cool surface; frost is frozen moisture on a freezing surface.

Related tags

FrostFreezing TemperatureIce CrystalsCondensationForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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