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Why can different amounts of dew appear on surfaces like grass and metal?

Answer and explanation

Correct answer: Their thermal properties and cooling rates differ

Direct answer: A, their thermal properties and cooling rates differ. Dew forms when a surface cools the air immediately above it to the dew point, allowing water vapour to condense into liquid droplets. Grass, metal, soil, and other surfaces do not gain or lose heat at exactly the same rate. Their colour, texture, exposure, contact with the air, heat conductivity, and ability to release stored heat can differ. Therefore one surface may reach the dew point sooner or remain colder for longer, producing more visible dew. A is correct because local surface temperature controls the nearby air and the onset of condensation. B is wrong because all surfaces operate under the same atmospheric physical laws; there is no different planetary vapour law. C is wrong because metal temperature can change, even though metal often conducts heat efficiently. D is wrong because water vapour is present in the air around grass as well. Memory cue: dew depends on moisture plus cooling; different surfaces cool differently, so dew amounts differ.

Related tags

DewSurface PropertiesCooling RateCondensationForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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