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If water vapour directly changes into ice crystals on a cold surface which form will develop?

Answer and explanation

Correct answer: Frost

Correct answer: D, frost. Frost develops when water vapour changes directly into solid ice crystals on a sufficiently cold surface. This direct gas-to-solid change is called deposition. The crystals form a white or icy coating on objects such as grass, leaves, roofs, or windows. A is wrong because dew is liquid water droplets formed when water vapour condenses into liquid water on a cool surface; it is not direct ice formation. B and C are wrong because mist and fog consist mainly of tiny liquid droplets suspended in the air, not ice crystals deposited on a surface. The wording “directly” and “ice crystals” gives the essential clue. In very cold conditions, the surface and nearby air must be cold enough for ice to form rather than liquid droplets. Memory cue: vapour to liquid is dew; vapour directly to ice is frost.

Related tags

FrostIce CrystalsWater VapourDepositionForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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