Dulong-Petit law
= Dulong-Petit law
{c}
{wiki=Dulong–Petit_law}
In the classical high-temperature limit, each independent harmonic mode contributes $k_B$ to the constant-volume heat capacity.
A classical crystalline solid has three vibrational modes per atom, giving $C_V\simeq3Nk_B$, or $3R$ per mole.