The heat capacities of the two solid phases of thorium and the liquid metal and the heats of transformation and fission are given in Table 6.6.

1.5 Thermal and Electrical Conductivity

The thermal conductivity of thorium metal is given in Table 6.7. The electrical conductivity of thorium metal is very dependent on its impurity content. Chiotti [C3] found that at room temperature the resistivity of thorium metal containing 0.2 w/o (weight percent) carbon was 37 X 10~* fi-cm, and that of metal containing 0.03 w/o carbon was 18 X 10’6 f2-cm. An extrapolated value for carbon-free thorium metal is 13 to 15 X 10’6 fl’cm. The temperature coefficient of resistivity is 3.6 to 4.0 X 10-3 per °С.