Magnetic Susceptibility - Conversion Between SI and CGS Units

Conversion Between SI and CGS Units

Note that these definitions are according to SI conventions. However, many tables of magnetic susceptibility give CGS values (more specifically emu-cgs, short for electromagnetic units, or Gaussian-cgs; both are the same in this context) that rely on a different definition of the permeability of free space:

\mathbf{B}^{\text{cgs}} \ = \ \mathbf{H}^{\text{cgs}} + 4\pi\mathbf{M}^{\text{cgs}} \ = \ (1+4\pi\chi_{v}^{\text{cgs}}) \mathbf{H}^{\text{cgs}}

The dimensionless CGS value of volume susceptibility is multiplied by 4π to give the dimensionless SI volume susceptibility value:

For example, the CGS volume magnetic susceptibility of water at 20°C is −7.19×10−7 which is −9.04×10−6 using the SI convention.

Read more about this topic:  Magnetic Susceptibility

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