Question

why does temperature remain constant at the melting point or boiling point​

Answer 1

Here is ur answer:

During melting, the heat being added to a substance goes into breaking apart the "molecules" or breaking down the crystal lattice, not into raising the temperature. During the phase change all the molecules continue to have the same kinetic energy, and therefore the temperature remains constant.

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Answer 2

During melting, the heat being added to a substance goes into breaking apart the "molecules" or breaking down the crystal lattice, not into raising the temperature. During the phase change all the molecules continue to have the same kinetic energy, and therefore the temperature remains constant.