what is dulong petit's law?? plz explain..

The Dulong–Petit law is a chemical law which was given by French physicists Pierre Louis Dulong and Alexis Thérèse Petit.This law states the classical expression for the molar specific heat capacity of a crystal.

The specific heat capacity C of a solid substance is equal to 3R/M,

 where R = Gas constant (measured in joule per kelvin / mole) and M = Molar mass (measured in kilogram / mole). 

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