HelmholtzDerivs

record HelmholtzDerivs "Derivatives of dimensionless Helmholtz-function w.r.t. dimensionless pressure, density and temperature"
    extends Modelica.Icons.Record;

    SI.Density d "Density";
    SI.Temperature T "Temperature";
    SI.SpecificHeatCapacity R "Specific heat capacity";
    Real delta(unit = "1") "Dimensionless density";
    Real tau(unit = "1") "Dimensionless temperature";
    Real f(unit = "1") "Dimensionless Helmholtz-function";
    Real fdelta(unit = "1") "Derivative of f w.r.t. delta";
    Real fdeltadelta(unit = "1") "2nd derivative of f w.r.t. delta";
    Real ftau(unit = "1") "Derivative of f w.r.t. tau";
    Real ftautau(unit = "1") "2nd derivative of f w.r.t. tau";
    Real fdeltatau(unit = "1") "Mixed derivative of f w.r.t. delta and tau";
end HelmholtzDerivs;