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What is the correct difference between dew and fog based on depth of saturation?

Answer and explanation

Correct answer: Dew has limited saturation near the surface, fog has a saturated lower-air layer

Correct answer: A. Dew forms when a surface, such as grass or a cool object, becomes cold enough for nearby water vapour to condense directly on it. The condensation is concentrated at the surface or in a very thin layer immediately above it. Fog is different: many tiny water droplets form within a noticeable layer of air close to the ground, so the air itself becomes cloudy and visibility falls. A correctly compares the depth of saturation. B is wrong because dew does not normally fall from clouds, and fog is not formed in soil. C is wrong because dew and fog commonly consist of liquid water droplets; ice crystals may occur only under sufficiently cold conditions. D is wrong because both require water vapour and suitable cooling. Memory cue: dew wets the surface, while fog clouds the air above it.

Related tags

GeographyDewFogSaturation-DepthCondensationForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The Atmosphere

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