Law of Dulong and Petit

In Thermodynamic, the law of Dulong and Petit stipulates that at high temperature, the molar Heat capacity $C$ of any solid tends towards the value

C= 3R \;

(in J·K^-1·mol^-1)

where

R

is the Constante perfect gases.

One can also write it while revealing the mass Heat capacity $C_m$ and the molar Masse M of the solid:

C_m= \ frac {3R} {M}

(in J·K^-1·kg^-1).

Thus this value limits is the same one for all the solids, which is about checked in practice. On the other hand, the way in which the molar heat capacity tends towards this value is different from one solid to another. To explain his behavior, one uses the Modèle of Debye.

External bonds

Petit has. - T., Dulong P. - L.: Research on some important points of the Theory of Heat . In: Yearly of Chemistry and Physics 10,395-413 (1819) (in English)

Category: Thermodynamics Dulong

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