function gasMixThCondMason input SI.Temperature T; input SI.MoleFraction X[:]; input SI.ThermalConductivity lambdaX[size(X, 1)]; input SI.MolarMass MW[size(X, 1)]; input SI.Temperature Tc[size(X, 1)]; input SI.AbsolutePressure Pc[size(X, 1)]; output SI.ThermalConductivity lambda; end gasMixThCondMason;