Melting Point

Melting Point

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The melting point of a solid is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium.

The melting point of a substance is presented in degrees Celsius at normal atmospheric pressure (1 atm, 1013 mbar, 760 mm Hg), unless a different pressure is specified.

• If a substance decomposes before the melting point at normal atmospheric pressure is reached, then this is indicated with the remark 'decomposes' behind the temperature.
• If a substance transforms directly from solid state into gass state this is called sublimation. The temperature at which this occurs at normal atmospherice pressure (unless specified differently) is then indicated, followed by the remark 'sublimates'.
• For substances dissolved with crystal water the apparent melting point of the substance is presented.

When melting points are far below 0�C, these are not always known accurately.