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Chemistry heating curve question

I'm a bit confused about why the changes of state happen when the temperature is constant?
Original post by K719
I'm a bit confused about why the changes of state happen when the temperature is constant?

‘During a change of the state of matter, the supplied energy is not used to increase the kinetic energy of the molecules, but to change the binding energies. Therefore, the temperature remains constant’

https://www.tec-science.com/thermodynamics/temperature/why-does-the-temperature-remain-constant-during-the-change-of-state-phase-transition/#:~:text=During%20a%20change%20of%20the,Therefore%2C%20the%20temperature%20remains%20constant.

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