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Which criterion is most useful in practical weather observation to distinguish fog from mist?

Answer and explanation

Correct answer: Visibility range

The correct answer is B, visibility range. Both fog and mist consist of tiny suspended water droplets, so colour is not a reliable practical basis for separating them. The useful operational difference is the degree to which they reduce horizontal visibility: fog is denser and reduces visibility more severely, while mist is generally thinner and permits a longer viewing distance. A is wrong because lighting and background can change apparent colour. C is unsafe, unnecessary, and scientifically irrelevant. D is wrong because ground elevation alone does not define whether an observation is fog or mist; either can occur in different settings depending on moisture, cooling, and air movement. Memory cue: “fog versus mist is judged mainly by how far you can see.”

Related tags

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

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