As explained above, each atom, ion or molecule of a paramagnetic substance behaves like a microgamete with a definite inherent magnetic moment of magnitude. When such a substance is placed in the external magnetic field. However, this tendency is opposed by the thermal motion of the particles (because magnetic susceptibility of paramagnetic substances varies white temperatures). Hence the actual arrangement taken up will depend upon the temperature. Lang even in 1905 put forward the following relationship between molar magnetic somatic susceptibility magnetic moment  and temperature T:
                                              
Where N is Avogadro’s number, k is Boltzmann constant and is a constant for the given substance. ( it represents the diamagnetic molar susceptibility of the substance by the induced by the applied magnetic field).

In eqn. , all quantities are Constance except and T. Thus determining for the given substance at different temperatures T, and the plotting a straight line graph will be contained, the slope of which will be equal to . Hence can be calculated.

The units of are ergs gauss-1. However, it is usually expressed in terms of Bohr magnetrons (B.M.)

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