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In fog water exists in air in which form?

Answer and explanation

Correct answer: As tiny water droplets suspended in air

Correct answer: A, as tiny water droplets suspended in air. Fog begins with water vapour, but water vapour itself is invisible. When air near the ground cools to saturation, some of the vapour condenses into extremely small liquid droplets. These droplets remain suspended in the air and scatter light, making the fog visible and reducing visibility. A is correct because it describes the form of water that is actually visible in ordinary fog. B is wrong because water vapour is a gas and cannot by itself be seen as fog. C is wrong because ordinary fog is not made of large ice crystals; ice particles require freezing conditions and are not the usual form described here. D is wrong because dust is not the water form responsible for fog, even though particles can sometimes help condensation. The important sequence is vapour, cooling, condensation, suspended droplets. Memory cue: vapour is invisible; condensed droplets make fog visible.

Related tags

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

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