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I believe you are asking about the heating curve for water that was presented in class. It illustrates that during a phase transition, there will be heat going into the reaction but there'll be no change in the temperature of the sample because all of that work is being used for the phase change.
The heating curve also showed that there is much more energy required to convert water from a liquid to vapor than from a solid to liquid; this was used to explain why someone with a burn from 100 degree water vapor would have a more serious injury than someone burned with 100 degree water.
Moreover, the heating curve showed that water vapor burns more than liquid water even though they are at the same temperature (100˚C, shown on Y axis), because water vapor has more heat than liquid water (shown by the fact that it is further right on the X axis, which represents heat).
Ultimately, the heating curve for water shows how the phases (solid, liquid, gas) of water change over time as the water is consistently heated. It also relates with the enthalpy of fusion and the enthalpy of vaporization because the heat accumulates, resulting in these phase changes.
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