It can be seen as the limit case of an Einstein solid at high temperatures. At lower temperatures, the heat capacity depends on temperature.
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In the classical high-temperature limit, each independent harmonic mode contributes to the constant-volume heat capacity.
The Dulong–Petit law is a principle in physical chemistry that states that the molar heat capacity of a solid element is approximately constant and can be estimated from its atomic mass. Specifically, it posits that the molar heat capacity (\(C_m\)) of a solid element can be expressed as: \[ C_m \approx 3R \] where \(R\) is the universal gas constant (\(R \approx 8.