X-Nico

Curie constant

where $N$ is the number of magnetic atoms (or molecules) per unit volume, $g$ is the Landé g-factor, $\backslash mu\; B$ (9.27400915e-24 J/T or A·m²) is the Bohr magneton, $J$ is the angular momentum quantum number and $k\; B$ is Boltzmann's constant.

see also