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Which air condition near the surface is more necessary for fog formation?

Answer and explanation

Correct answer: Saturated or nearly saturated air

Correct answer: A. Fog is a cloud of very small water droplets or ice particles located at or close to the ground. For fog to form, the air near the surface must be cooled to its dew point or must receive enough moisture to become saturated. Condensation then produces suspended droplets that reduce visibility. B is wrong because dry air lacks sufficient water vapour. C is not a necessary condition; very hot air generally holds more vapour and must cool before saturation. D is wrong because normal air contains several gases and fog depends mainly on moisture and cooling, not oxygen alone. Memory cue: fog is a near-ground cloud, so saturation near the ground is essential.

Related tags

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

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