Thermal conductivity along isotherms near the critical point measured directly by Michels et al. 39 and calculated from the thermal diffusivity data of Becker and Grigull52 with ρ and Cp from the Albright et al. equation of state. 127 Michels et al.39 thermal conductivity isotherms are designated by symbols; ◆, 304.357 K; ■,305.271 K; ●, 307.848 K. Becker and Grigull52 isotherms are designated by symbols: ◇, 304.362 K; □, 305.228 K, ○, 307.958 K. The dashed lines show the calculated thermal conductivity with the present correlation with the Span and Wagner114 equation of state and the solid lines show the calculated thermal conductivity with the present correlation with the Albright et al. 127 scaled equation of state. The critical density is shown with the dot–dashed line.