Melting and Freezing [closed]








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Ok so I needed some help understanding one concept, for eg:- we are in an isolated room that has a room temperature of 0 degrees Celsius. And I bring in some water in the room, so eventually it will start freezing up at 0 degrees Celsius right?(doesn't matter the time), and when it's in an ice (solid) state its temperature is going to stay at 0 degree Celsius? if so then will it also not start melting if at 0 as the melting point of ice is also 0 degrees celsius, and as the room is 0 degrees celsius this will continue to loop?




No, the water wouldn't cycle in an infinite loop between liquid and ice.


Let's assume you introduced three different containers of water at $T=\pu {0 ^{\circ}C}$ and $\pu{p = 1 atm}$ into an infinite, constant-temperature heat bath, also at $T=\pu {0 ^{\circ}C}$ and $\pu{p = 1 atm}$ . These contain: (***a***) liquid water; (***b***) a 50-50 ice-water mixture; and (***c***) ice. Let's further assume the containers are diathermal, i.e., they allow the flow of heat.


In order for the liquid water in container ***a*** to turn to ice, heat would need to flow from that container to the bath. In order for the ice in container ***c*** to turn to liquid, heat would need to flow from the bath to that container. And the same applies to container ***b***: heat has to flow in to increase the proportion of water, and out to increase the proportion of ice.


According to classical thermodynamics, since they are all at $\pu {0 ^{\circ}C}$, there would be no heat flow between the water in the containers and the bath (no temperature difference means no heat flow). Thus they would all stay as they are.


However, statistically, I suppose it is possible you might have fluctuations that could cause changes. This is something I would need to think about further.


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