Figure 1
Illustration: Alan Stonebraker

Figure 1: An adaptation from Einstein’s original model for the heat capacity of diamond as a function of temperature [2]. The normalized heat capacity C/NkB is plotted as a function of the normalized temperature T/θE, where the Einstein temperature θE=1320 K is a quantity chosen by Einstein to give a good fit to experimental data (points in the figure). 3NkB is the Dulong-Petit result according to classical physics.