**Law 0.0.1 **  The **Dulong Petit law** states that the [molar specific heat](https://kaedon.net/l/^kjk0#fm30) for most bulk materials is a constant at high temperatures.
\[C = N_{atoms}\frac{\partial u}{\partial T} = 3k_BN_{atoms}\]
\[c_{mol}=\frac{C}{N_{mol}}=\frac{3k_BN_{atoms}}{N_{mol}} = 3k_BN_{Avogadro} = 3R\]