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Simon–Glatzel equation : ウィキペディア英語版
Simon–Glatzel equation

The Simon–Glatzel equation〔Simon F. E., Glatzel G., Z. Anorg. (Allg.) Chem., 1929, 178, 309-312〕 is an empirical correlation describing the pressure dependence of the melting temperature. The pressure dependence of the melting temperature is small for small pressure changes because the volume change during fusion or melting is rather small. But very high pressures have a significant effect because the liquid has (normally) a larger volume than the solid and a higher pressure makes the melting thermodynamically unfavorable and leads therefore to a higher melting temperature. If the liquid has a smaller volume than the solid (as for ice and liquid water) a higher pressure leads to a lower melting point.
== The equation ==
T_M = T_ \left( \frac + 1 \right)^\frac
TRef and PRef are normally the temperature and the pressure of the triple point, but the normal melting temperature at atmospheric pressure are also commonly used as reference point because the normal melting point is much easier accessible. Typically PRef is then set to 0. ''a'' and ''c'' are adjustable and component specific parameters.

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