Explain why there is no rise in temperature of a substance when it undergoes a change of state through heat is supplied continuosly
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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.
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Every substance requires some amount of "extra" or better say "hidden heat" to change its state. That's why there is no change temperature of ice at 0 C as all the heat that is being supplied is getting used up in converting ice from solid state to liquid state. This "hidden heat" is known as latent heat. Specifically, when a substance is at its melting point (say ice at 0 C), the amount of heat required to change its state is known as the latent heat of fusion.
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