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RE: Can a liquid boil and freeze at the same time?
It is pretty difficult to control at the triple point as once the substance boil off, the vapor pressure suddenly change aside from the vaporization energy. As a result the equilibrium is difficult to control consistently; but I guess this is one of the best demonstrations I had seen in the internet :DD
@mcw Thank you. The exact equilibrium is difficult to maintain, even at the starting point of this experiment. It uses rough values, which is good enough for a physical demonstration.