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Curie's law

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The susceptibility (χ) of a paramagnetic substance is proportional to the thermodynamic temperature (T), i.e. χ = C/T, where C is the Curie constant. A modification of this law, the Curie-Weiss law, is more generally applicable. It states that χ = C/(T – θ), where θ is the Weiss constant, a characteristic of the material. The law was first proposed by Pierre Curie and modified by another French physicist, Pierre-Ernest Weiss (1865–1940).

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