A solid is melted and allowed to cool and solidify again. The temperature is measured at equal intervals of time. The graph below shows the change of temperature with time.The part of the curve that is practically horizontal due to

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A solid is melted and allowed to cool and solidify again. The temperature is measured at equal intervals of time. The graph below shows the change of temperature with time.<br /><img src='https://www.fatskills.com/images2/word-image-262.png' /><br />The part of the curve that is practically horizontal due to