What happens to the temperature of an object once it starts a phase change?

The temp is constant until the phase change is complete. If you are melting forsterite for example, the temp will increase to 1890 C, then hold steady. The latent heat of fusion is the energy required to break the chemical bonds in the crystal before it can change to a liquid. Once the solid has changed to a liquid the temp will begin to increase again up to the boiling point.What happens to the temperature of an object once it starts a phase change?
The temperature remains constant, but the internal energy of the object changes.





For example, as you add heat energy to water at 100 Celsius, it gradually becomes steam at 100 Celsius.

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