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Why do fog and mist droplets not immediately fall like raindrops?

Answer and explanation

Correct answer: They are extremely small, so air resistance can keep them suspended.

Answer: B. Fog and mist droplets are much smaller than ordinary raindrops. Gravity pulls every droplet downward, but a very small droplet has a low mass and a relatively large effect of air resistance compared with its weight. Gentle air movement and turbulence can therefore keep it suspended for some time. Raindrops are larger, so they have enough weight to fall more clearly and rapidly. A is wrong because gravity continues to act. C is wrong because these are water droplets, not stone. D is wrong because fog and mist occur over land as well as near water. The question asks why they do not immediately fall, not why they never fall; droplets can eventually settle, evaporate, or combine. Memory cue: tiny droplet plus air resistance equals suspension.

Related tags

FogMistAir ResistanceSuspended DropletsForms Of Condensation: DewFrostAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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