Paramagnetic substance, thermodynamics

Curia s law The susceptibility (x) of a paramagnetic substance is proportional to the thermodynamic temperature (7), i.e. % = Cl T, where C is the Curie constant. A modification of this law, the Curie-Weiss law, is more generally applicable. It states that % = C/ (T- 9), where 6 is the Weiss constant, a characteristic of the material. The law was first proposed by Pierre Curie and modified by another French physicist, Pierre-Emest Weiss (1865-1940). 

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