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When fog forms, water vapour becomes visible in which state?

Answer and explanation

Correct answer: As tiny liquid droplets

Direct answer: A, as tiny liquid droplets. Water vapour is water in the gaseous state and is normally invisible. When moist air cools sufficiently, it may reach saturation and condensation begins. The vapour then changes into very small liquid-water droplets. These droplets remain suspended in the air close to the ground, and the collection of many such droplets is seen as fog. A is correct because visible fog is made of suspended microscopic liquid droplets, not invisible vapour itself. B is wrong because dry gas contains no condensed water droplets and cannot describe visible fog. C is wrong because lava is molten rock and has no role in fog formation. D is wrong because soil lumps are solid earth material, not atmospheric water. The key distinction is between invisible vapour and visible droplets. Memory cue: condensation makes water visible; fog is a cloud at or near the ground.

Related tags

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

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