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What is the fundamental difference between dew and fog?

Answer and explanation

Correct answer: Dew deposits on surfaces while fog remains as suspended droplets in air

Correct answer: A. Both dew and fog result from atmospheric moisture reaching saturation and condensing, but their locations are different. Dew is formed when water vapour condenses directly on a cooled solid surface such as grass, leaves, soil, or a vehicle. Fog consists of tiny water droplets suspended in the air near the ground; it is essentially a cloud at or close to the surface. A is correct because it states this fundamental surface-versus-air distinction. B is wrong because dew is usually liquid water above freezing, while fog is not dust and may contain liquid droplets or, in suitable cold conditions, ice particles. C is wrong because both can occur in many environments wherever cooling and moisture conditions are suitable. D is wrong because condensation is central to the formation of both. Memory cue: dew touches the surface; fog floats in the air. The distinction is mainly about location, not simply about whether water is present.

Related tags

DewFogCondensationSurface CondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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