Measurements of Thermal-Conductivity Divergence in the Supercritical Region of C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Precise thermodynamic measurements have been made to determine the thermal conductivity of C${\mathrm{O}}_{2}$ near its critical density using a horizontal parallel-plate apparatus. Tests were conducted for $0.89&lt;T\ensuremath{-}{T}_{c}&lt;5.48$ \ifmmode^\circ\else\textdegree\fi{}C. The exponent for the thermal-conductivity divergence on the critical isochore was found to be 0.67 \ifmmode\pm\else\textpm\fi{} 0.02, in good agreement with recent predictions from theory and from light-scattering experiments.

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