Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. Here M = chi * H. Where M is the magnetization of the material (the magnetic dipole moment per unit volume), measured in amperes per meter, and H is the magnetic field strength, also measured in amperes per meter. Chi is therefore a dimensionless quantity.
\chi_\text{v} = \frac{\mathbf{M}}{\mathbf{H}}
Magnetic Susceptibility Unit