How can heat melt solids without changing the temperature?

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I’m trying to understand heat of fusion and I just can’t find myself on understanding how something can melt without changing the temperature?

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any chance you could elaborate on your question? do you mean nuclear fusion? that’s not melting, it’s a different process. if you mean something like heat diffusion or the process that creates equilibrium between two materials of different temperature or something?

There are interactions between molecules in both liquid and solid forms. The energy that would be increasing the temperature of the solid past the melting point instead goes into changing the bonds from “solid bonds” to “liquid bonds”. Likewise, when liquid is boiling, the “liquid bonds” are being broken, releasing the molecules as gas, instead of the liquid being heated past the boiling point.

What does melting have to do with fusion?

Water going from solid to liquid happens at 0c. The water temperature will pause at 0 while the added energy (heat) is used to change state from ice to water. This is called a phase transition.

I take it you mean at the point at where it melts and not the entire process.

It’s because at a certain point any extra heat you add will cause molecules to change from being part of the solid to leaving the solid. The extra energy causes them to go bye bye rather than raising the temperature because they have enough energy to now leave.