Electromagnetic permeability relates magnetic flux density to magnetic field strength through in an isotropic linear medium.
Vacuum permeability is the magnetic permeability appearing in the vacuum Maxwell equations. In SI, it relates vacuum magnetic field strength to magnetic flux density through and obeys , where is the speed of light and the vacuum permittivity.
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Permeability is a property of a material that indicates how well it can support the formation of a magnetic field within itself. In the context of electromagnetism, permeability is typically denoted by the symbol \( \mu \). It quantitatively describes the ability of a material to become magnetized when exposed to an external magnetic field and is central to understanding magnetic materials' behavior.