The temperature of 0ºC is both the temperature at which ice melts and that at which water freezes, as is well known. What will happen if we put a piece of ice at temperature 0ºC into a vessel containing water also at 0ºC?
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Sol. Ice melts at 0ºC only if the necessary amount of heat be imparted to it–about 80 calories to every gramme of ice–while water will only freeze if the same amount of heat is taken from it. Therefore if the vessel is not heated or cooled from outside, the water will not freeze and the ice will not melt. A mixture of water and ice at 0ºC will be in ‘thermodynamic equilibrium’.
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