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In which condition can water vapour directly form ice crystals?

Answer and explanation

Correct answer: Temperature is below freezing

Water vapour can change directly into solid ice crystals when the surrounding temperature is below the freezing point and the conditions allow deposition. This is different from condensation, in which vapour first becomes liquid water. On a sufficiently cold surface, vapour may form ice crystals directly, producing frost. Cold air alone is not the only consideration; moisture must also be present, but among the given choices, a temperature below freezing is the necessary condition that identifies the process.

Option B is correct because temperatures below freezing permit water vapour to form or deposit as ice crystals. A very hot surface encourages evaporation rather than ice formation. Zero humidity provides no water vapour from which crystals could form, and the Sun being overhead at noon does not describe a freezing condition. Therefore, the best answer is the below-freezing temperature, while frost is the visible result when suitable moisture and surface conditions are also present.

Related tags

GeographyDepositionFrost

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