Why doesn’t the temperature of a substance rise during the state of change ?
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There is no rise of temperature because the heat provided is utilized in increasing the potential energy between the molecules i.e. increasing the interspacing between the molecules. Every substance requires some amount of "extra" or better say "hidden heat" to change its state.
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During the change of state , the temperature increases gradually and slowly, the reason in because, All the heat energy that is provided is being used up in order to break the forces of attraction between the molecules of that state.
We call this latent heat, as there is no change in temperature during the change of state
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