Equation 2 from:
The International Association for the Properties of Water and
Steam
Milan, Italy
September 1993
Release on the Pressure along the Melting and the Sublimation
Curves of Ordinary Water Substance
function pmIceIII_T extends Modelica.Icons.Function; input SI.Temperature T "Temperature"; output SI.Pressure pm "Melting pressure of iceIII(for T from 251.165 to 256.164 K)"; end pmIceIII_T;