ToolsProcessingModelsThermophysicalEquation of stateOptionsLinearOn this pageLinearDensity, ρ\rhoρ [kg/m3^33] ρ=ρ0+ψp\rho = \rho_0 + \psi pρ=ρ0+ψp Entropy, SSS [J/kg/K ] S=−1Tψln(ρ0+ψpρ0+ψpstd)S = -\frac{1}{T \psi}\ln\left(\frac{\rho_0 + \psi p}{\rho_0 + \psi p_{\std}}\right)S=−Tψ1ln(ρ0+ψpstdρ0+ψp) Compressibility, ψ\psiψ [s2^22/m2^22] ψ=constant\psi = constantψ=constant Usage The linear equation of state is specified as: equationOfState{ psi <scalar>; rho0 <scalar>;} Where psi : Compressibility [s2^22/m2^22] rho0 : Reference density [kg/m3^33] Further information Source code linear