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If the surface temperature is below freezing and water vapour changes directly into ice crystals, which form will develop?

Answer and explanation

Correct answer: Frost

Direct answer: B, frost. Frost forms when water vapour changes directly into solid ice crystals on a surface that is at or below freezing. This direct gas-to-solid change is called deposition. The result is a visible icy coating on grass, leaves, roofs, or other exposed surfaces. A, mist, consists of small liquid droplets suspended in air, so it is not a deposited ice coating. C, dew, consists of liquid water droplets formed by condensation on a cool surface; it is not the direct formation of ice crystals. D, fog, is also made of tiny droplets suspended in air near the ground and is identified by reduced visibility, not by ice crystals deposited on a surface. The clues “below freezing,” “directly,” and “ice crystals on a surface” all point to frost. Memory cue: vapour to liquid gives dew; vapour directly to ice gives frost.

Related tags

FrostDepositionIce-CrystalsDewForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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