Wiktionary
heat conductivity
n. thermal conductivity
Usage examples of "heat conductivity".
For several reasons, and outstanding heat conductivity is only one of them, graphite looks good to this guesser.
And those insulators, though you can't see them, are commercial diamonds because of their useful heat conductivity.
Temperature control is easy: we vary the heat conductivity of the sphere to pick up and hold enough of the energy from the stars within.