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In which situation is frost formation least likely?

Answer and explanation

Correct answer: Surface temperature above freezing and air dry

Answer: A. Frost requires two helpful conditions: a surface at or below freezing temperature and enough atmospheric moisture to form a visible ice deposit. In A, the surface is above the freezing point and the air is dry, so both the temperature and moisture conditions are unfavourable. Frost is therefore least likely there. B is favourable because a sub-freezing surface and moist air support freezing deposition. C is also favourable because clear nights commonly allow strong radiational cooling, while sufficient moisture supplies the water. D can permit night cooling in an exposed area, so it is more favourable than A, although moisture and sufficiently low temperature must still be present. Memory cue: frost needs cold plus moisture; remove either one and frost becomes unlikely.

Related tags

FrostFreezing TemperatureMoistureLimiting ConditionsForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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