Why does the temperature of a substance remains constant during melting and boiling even when heat is being supplied to it continuously .

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Solution

The temperature of a substances remains constant during melting and boiling even when heat is being supplied to it continuously because the heat that is supplied is being used up in changing a state of matter by overcoming intermolecular force of attraction.This heat is known as latent heat of fusion for melting and latent heat of vaporisation for boiling.therefore the temperature remains same.

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