Question

why does the temperature of a substance remain constant during its melting point or boiling point ​

Answer 1

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

Explanation:

the temperature of substance remains constant during melting and boiling point because all heat goes into state changing by increase intermolecular space of substance and reducing in the intermolecular force of attraction of substance.