When we heat ice at -10°C, its temperature starts raising. When it reaches 0°C it stops even we continue heating. What happens to that supplied heat? What do you call that heat?
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Explanation:
That would depend on the conditions under which it melted.
If the solid of a pure substance is melted under conditions of constant pressure, then its temperature will remain constant. If the same solid is melted inside a closed container, then the temperature will not remain constant. That is because the melting temperature depends on pressure. Assuming that the liquid phase has a lower density than the solid phase, which is the common case, then the melting point increases as the pressure increases. Thus the melting temperature will be increasing as the solid melts, because the pressure will be increasing as the solid melts.
If the solid is an alloy, rather than a pure substance, then things get somewhat more complicated.
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