What term describes the process when snow vanishes directly into vapor without melting, even at temperatures below freezing?

CHEMICAL ENGINEERING MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
CHEMICAL ENGINEERINGchemical-engineering
Published
12 Mar 2019
Last updated
28 May 2026

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Explanation

The disappearance of snow in temperatures below zero degrees Celsius without turning into liquid first is called sublimation. This process involves the solid ice transforming directly into water vapor, bypassing the liquid phase. Evaporation and vaporization refer to liquid turning into vapor, while melting is the change from solid to liquid.

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