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If dew is on the surface but the air is clear what is the best conclusion?

Answer and explanation

Correct answer: Condensation occurred on surface but suspended air droplets are not enough

Dew and fog are different mainly because of where condensation occurs. Dew is formed directly on a cool surface, such as grass, leaves, or soil. Fog consists of many tiny water droplets suspended in the air near the ground, so it reduces visibility. It is therefore possible to have dew on the ground while the air above remains sufficiently clear and does not contain enough suspended droplets to produce fog.

Option A is correct because condensation has occurred on the surface, while the air does not have enough suspended droplets to make visible fog. The presence of dew does not prove that fog is dense, and it certainly does not mean that the air lacks water vapour. Frost cannot be concluded either, because frost requires ice formation or freezing conditions, whereas dew is normally liquid. Location and physical state provide the useful distinction.

Related tags

DewClear AirSurface Condensation

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