Melting points

  • The melting points of substances which contract on melting are lowered by increase of pressure, while the melting points of substances which expand on melting are raised by increase of pressure.
  • In general, the solids on melting increase in volume and the liquids on solidification, decrease in volume. But there are solids like ice, cast iron, antimony and bismuth, which contract on melting and expand on freezing.
  • Coins of gold, silver or copper are not casted, ie made from molten metals, because on solidification their design gets distorted. To avoid such distortions, the coins are stamped in a heavy duty press.
  • Impurities tend to reduce the melting point of solids.
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