Law 0.0.1  The Dulong Petit law states that the molar specific heat for most bulk materials is a constant at high temperatures.
\[C = N_{atoms}\frac{\partial u}{\partial T} = 3k_BN_{atoms}\]\[c_{mol}=\frac{C}{N_{mol}}=\frac{3k_BN_{atoms}}{N_{mol}} = 3k_BN_{Avogadro} = 3R\]