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How can strong wind reduce dew formation?

Answer and explanation

Correct answer: It mixes away the saturated moist layer near the surface

Direct answer: A is correct. Dew is favoured by calm conditions because the surface can cool at night and a shallow layer of cool, moist air can remain close to it. If that layer reaches saturation, vapour condenses on nearby surfaces. Strong wind increases turbulence and mixes this near-surface air with air from above. The mixing can bring in relatively drier or warmer air and prevents a stable saturated layer from remaining next to the cold surface. Consequently, the air or surface may be less likely to reach the conditions needed for dew deposition. A accurately describes this mixing effect. B is wrong because wind does not always make dew point zero. C is wrong because wind alone does not necessarily freeze water vapour into ice. D is wrong because wind does not make night as hot as the Sun. Calm, clear, humid nights are generally more favourable for dew. Memory cue: calm air lets dew settle; strong wind stirs the moisture away.

Related tags

DewWindMixingHumidityForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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