# magnetic permeability

## Definitions

### Electronics

- Its symbol is μ. A quantitative indicator of the
__response__ of a material or __medium__ to a magnetic field. It is expressed by the following formula: μ = *B/H*, where *B* is the magnetic flux density of the material or medium, and *H* is the strength of the surrounding magnetic field. Relative permeability is obtained using the following formula: μ_{r} = μ/μ_{0}, where μ_{r} is relative permeability, and μ_{0} is the permeability of free space. The __absolute__ permeability of __free space__ is a physical __constant__ equal to approximately 1.256637 × 10^{-6} __henry__ per meter, and its relative permeability is equal to 1, as seen by the this __formula__. Materials whose relative permeability is less than 1 are diamagnetic, those slightly above 1 are paramagnetic, and those substantially above 1 are __ferromagnetic__. Also known as magnetic __conductivity__, or permeability (1). - synonymmagnetic conductivity

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