IYPT 1998, Задачи на турнира — Задача 10. Repeated freezing

11th IYPT (1998)

Заглавие в източника

Sources: Official version 97/10/15, Prouza 10-20-1997, Školská fyzika, 1996/1997, 3, 71—72, Vlado Koutny ca. 1999
Selected at the Preparatory Seminar in Germany on Oct. 15, 1997
Exemplary solutions for 1998 →

Условие

While a vessel filled with an aqueous solution of a volatile fluid, e.g., ammonia, ethanol or acetone, is being cooled, repeated freezing and melting may be observed near the surface. Describe and explain the phenomenon.

Решение

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Оригинал в Архива: 1998.txt