isothermal compressibility factor as function of pressure and temperature
function kappa_pT extends Modelica.Icons.Function; input Units.SI.Pressure p "pressure"; input Units.SI.Temperature T "temperature"; input Integer region = 0 "if 0, region is unknown, otherwise known and this input"; output Units.SI.IsothermalCompressibility kappa "isothermal compressibility factor"; end kappa_pT;