At a phase transition, such as at the boiling
point of water, the temperature of a substance does not rise as energy is supplied as
heat: the energy is used to drive the endothermic transition, in this case to vaporize the
water, rather than to increase its temperature. Therefore, at the temperature of
a phase transition, the heat capacity of a sample is infinite.
At a phase transition, such as at the boilingpoint of water, the temperature of a substance does not rise as energy is supplied asheat: the energy is used to drive the endothermic transition, in this case to vaporize thewater, rather than to increase its temperature. Therefore, at the temperature ofa phase transition, the heat capacity of a sample is infinite.
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