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;