function derThermalConductivity_derT_derrho input Units.SI.Temperature T "Temperature (K)"; input Units.SI.Density rho "Density (kg/m3)"; input Real der_T "Temperature time derivative (K/s)"; input Real der_rho "Density time derivative (kg/m3/s)"; output Real der_k "thermal conductivity time derivative (W/m/K/s)"; end derThermalConductivity_derT_derrho;