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For any substance, why does the tempertu...

For any substance, why does the temperture remain constant during the change of state?

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The heat energy supplied to a substance during the change of state (at its melting point or boiling point) is all used up in overcoming (or breaking) the force of attraction between its particles without increasing its kinetic energy. Since the heat (or latent heat) supplied during the change of state does not increase the kinetic energy of the substance, therefore, no rise in temperature takes place. The temperature remains constant.
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