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Why can surface temperature sometimes be more important than air temperature in dew formation?

Answer and explanation

Correct answer: Because dew forms on surfaces and the surface can be locally colder

Answer: A. Dew is deposited on a surface, so the temperature of that exact surface controls whether the air immediately touching it reaches saturation and condensation occurs. During clear, calm nights, a leaf, grass blade, or roof may lose heat by radiation and become colder than the nearby air. If the surface reaches the dew point, water vapour condenses into droplets on it. A is correct because it connects the location of dew with local surface cooling. B is wrong: moist air and water vapour are needed. C is wrong because air temperature is not always zero; dew can form at many temperatures above freezing. D is the opposite of the scientific relationship. Distinguish air temperature from the temperature of the object on which dew appears.

Related tags

DewSurface TemperatureDew PointRadiative CoolingForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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