The (average) kinetic energy of the free electrons (mass = m, |charged| = e), in a metal, at a temperature T in kelvin, equals (k = Boltzmann’s constant). If a graph were to be plotted between the (average) deBroglie wavelength λB , associated with these free electrons, and 1/√T, the slope (s) of the graph, can be used to calculate the Boltzmann constant, k, through the relation
