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Why can fog droplets form more easily when dust or smoke is present?

Answer and explanation

Correct answer: These particles act as condensation nuclei

Correct answer: A, these particles act as condensation nuclei. Water vapour is an invisible gas, but when moist air cools to saturation, vapour can condense into liquid droplets. Tiny dust, smoke, salt, or other aerosol particles provide surfaces on which water molecules can gather. These surfaces are called condensation nuclei. In fog, the droplets remain suspended near the ground and scatter light, reducing visibility. A is correct because it describes the actual supporting role of particles. B is wrong: dust and smoke do not make the whole air completely hot; heating would generally oppose condensation. C is wrong because the particles do not destroy water vapour; they help it change into droplets. D is wrong because gravity is not stopped; very small droplets fall extremely slowly and air movement keeps them suspended. Memory cue: nuclei are tiny meeting points for water vapour.

Related tags

GeographyFogCondensation-NucleiAerosolsForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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