At the melting point, a substance changes from solid to liquid. The temperature remains constant during melting because the energy supplied breaks intermolecular bonds rather than increasing kinetic energy.
The reverse process (liquid to solid) occurs at the same temperature and is called freezing.
Different substances have different melting points. Water melts at 0 C; iron melts at 1538 C. The melting point is affected by pressure but this effect is small for most substances.
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