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Why is rainfall not necessary even when air in fog is saturated?

Answer and explanation

Correct answer: Droplets may be too small to become fallable

Correct answer: A. Saturated air contains as much water vapour as it can hold at its current temperature, so some vapour may condense into tiny suspended droplets. In fog, these droplets usually remain very small and are kept floating by air movement; they do not necessarily combine into large, heavy raindrops. Rainfall requires drops or ice particles to grow enough for gravity to pull them downward. A is correct because it distinguishes suspended fog droplets from precipitation-sized drops. B is wrong because saturated air still contains water vapour; saturation means the capacity is filled, not that vapour is absent. C is wrong because fog is made of tiny liquid droplets or sometimes ice particles, not dry gas. D is wrong because saturation is closely related to condensation. Memory cue: saturation can make fog, but droplet growth makes rain.

Related tags

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

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