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When can a surface’s temperature be more decisive than the general air temperature for dew formation?

Answer and explanation

Correct answer: When local radiational cooling brings the surface to the dew point

The correct answer is B. Dew forms on a surface, so that surface’s temperature matters directly. At night, an exposed surface can lose heat by radiation and cool to the dew point, even while the general air temperature remains slightly higher. The air touching the surface then becomes saturated, allowing water vapour to condense into droplets. Moisture must be present for dew to form.

Related tags

DewDew PointRadiational CoolingSurface TemperatureForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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