We have measured the thermal conductivity of argon at temperatures from 302 K down to 150.8 K and at densities up to 25 molthinsp;Lminus;1. The data were obtained with a steadyhyphen;state method and we employed a guarded parallelhyphen;plate apparatus designed especially for investigating the thermal conductivity of fluids in the critical region. To interpret the data in the critical region a scaled crossover equation of state for argon in the critical region has been constructed. Equations for the thermal conductivity and viscosity of argon as a function of density and temperature are presented. thinsp;
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