permeability

- 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 =, where*B/H*is the magnetic flux density of the material or medium, and*B*is the strength of the surrounding*H*__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 permeability. - The
__quality__or__state__of being__permeable__.

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