A thermally insulated sample of water at 2°C is exposed to rapid vapour removal. Neglect sensible-heat changes during the brief freezing stage. At the instant the remaining liquid has just frozen, whi

Question

A thermally insulated sample of water at 2°C is exposed to rapid vapour removal. Neglect sensible-heat changes during the brief freezing stage. At the instant the remaining liquid has just frozen, which best describes the initial sample?

TestHub · Accepted Answer

Some water evaporates and carries latent heat away. The original sensible heat and the freezing of the remaining liquid supply this energy. Writing x L v ​ = 4200 ( 2 ) + ( 1 − x ) L f ​ gives x ≃ 0.12 , so part has evaporated and the rest has frozen. This describes that instant, not the eventual outcome under indefinite pumping. Answer C.

Physics - Heat & Thermo Question with Solution | TestHub

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