Return specific Isothermal compressibility as a function of pressure p, temperature T and composition X
function kappa_pTX input Modelica.SIunits.AbsolutePressure p "Pressure"; input Modelica.SIunits.Temperature T "Temperature"; input Modelica.SIunits.MassFraction X[:] "Mass fractions "; output Modelica.SIunits.IsothermalCompressibility kappa "Isothermal compressibility"; end kappa_pTX;