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Why is air near saturation needed for fog formation?

Answer and explanation

Correct answer: Because only then water vapour can turn into tiny droplets

Correct answer: A. Fog forms when water vapour near the ground condenses into very small liquid droplets, or sometimes ice particles, suspended in air. Air near saturation already contains nearly as much water vapour as it can hold at that temperature. A small fall in temperature, or the addition of moisture, can then make condensation begin. The droplets remain suspended and reduce visibility, producing fog. B is nonsense because saturation does not turn air into stone. C is opposite to the process: saturation means high moisture content, not removal of all moisture. D is unrelated; fog formation depends mainly on moisture, cooling, and condensation, not on the Sun being physically stopped. Memory cue: near saturation means the air is nearly full of vapour and ready to condense.

Related tags

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

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