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Why does water vapour change from invisible gas to visible droplets during fog formation?

Answer and explanation

Correct answer: The air cools and approaches saturation

Correct answer: A. Individual water-vapour molecules are too small to see, so water vapour itself is invisible. When moist air cools, its capacity to hold water vapour decreases. The relative humidity therefore rises, and near saturation the vapour begins to condense on microscopic particles in the air. The resulting tiny liquid droplets are large enough to scatter light, making the fog visible. B is wrong because zero air pressure is not required for condensation. C describes no atmospheric process. D is unrelated and would generally promote warming or evaporation rather than explain fog droplets. The useful sequence is cooling, rising relative humidity, saturation, condensation, and reduced visibility. Memory cue: invisible vapour becomes visible only after it gathers into light-scattering droplets.

Related tags

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

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