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If frost forms on a surface why will it not be called fog?

Answer and explanation

Correct answer: Because frost is solid ice crystals on surface and fog is droplets in air

Direct answer: D is correct. Frost and fog are both related to atmospheric moisture and cooling, but they differ in physical state and location. Frost forms when water vapour deposits as ice crystals on a surface whose temperature is at or below freezing. Fog consists of very small liquid water droplets, or sometimes supercooled droplets, suspended in air near the ground. Therefore a white icy coating on grass, a roof, or a road is frost, not fog. A is wrong because frost is made of water in solid form. B is wrong because fog forms in air near the ground, not inside Earth. C is wrong because frost is not always liquid; its defining appearance is solid ice. D correctly identifies both distinctions. A useful warning is that poor visibility alone suggests fog, whereas a frozen coating on a surface suggests frost.

Related tags

FrostFogIce CrystalsWater DropletsForms Of Condensation: DewAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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