Dulong-Petit law

ID: dulong-petit-law

Dulong-Petit law by Ciro Santilli 37 Updated 2025-07-16
Observation that all solids appear to have the same constant heat capacity per mole.
It can be seen as the limit case of an Einstein solid at high temperatures. At lower temperatures, the heat capacity depends on temperature.
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.

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