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How can smoke and dust particles help fog formation?

Answer and explanation

Correct answer: They can act as condensation nuclei

Correct answer: A. Tiny particles suspended in air can provide surfaces on which water vapour begins to condense. Such particles are called condensation nuclei. Smoke, dust, salt and other aerosols may serve this role when the surrounding air is sufficiently moist and cooled. Water vapour does not usually form a visible droplet as easily in completely particle-free air; attachment to a tiny nucleus helps the initial droplet develop. A is correct because it identifies this physical role. However, particles alone do not guarantee fog: moisture, cooling and suitable atmospheric conditions are also needed. B is wrong because particles do not turn vapour into soil. C is wrong because they do not reduce air pressure to zero. D is unrelated to condensation. Memory cue: nuclei are tiny starting points for droplets; moisture plus cooling still supplies the water and condition.

Related tags

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

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