Only data available for the thermal diffusivity and conductivity of the liquid state of plutonium have been reported. Wittenberg and coworkers77,78 mea­sured the thermal diffusivity (D) from which they derived the thermal conductivity, which is constant in the measured range (973 to 1073 K). As discussed above, the two publications by these authors are not consistent. In the early one,78 Wittenberg gave 0.017-0.021 and 0.022-0.023 cm2 s-1 for the thermal diffusivity in two experiments with different heating

rates, yielding to l = 5.4 Wm-1 K-1 and 6.3 Wm-1 K-1, respectively. In the later publication,77 Wittenberg reports D = 0.057-0.056 cm2 s-1 for the temperature range 948 to 1073 K, yielding l = (17±1) Wm-1 K-1. This latter value is recommended here.