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Why is air moisture observed in a frost forecast?

Answer and explanation

Correct answer: Without moisture, the supply for ice deposition would be limited.

Answer: A. Frost is not determined by low temperature alone. A cold surface must also have access to water vapour so that moisture can deposit or freeze as ice. If the air is very dry, the surface may become cold enough, yet little frost may form because there is not enough moisture available. B is wrong because moisture can support frost when temperatures are low; it does not always prevent it. C is wrong because frost is directly connected with atmospheric moisture. D is wrong because the presence of moisture does not generally make a cold surface hot. A forecast therefore considers both the expected surface temperature and the moisture supply. Memory cue: frost needs two ingredients—cold surface and available moisture.

Related tags

Frost ForecastMoistureIce DepositionWater VapourForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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