Magnetic permeability. (n.d.). In YourDictionary. Retrieved from https://www.yourdictionary.com/magnetic-permeability
A measure of the ability of a substance to sustain a magnetic field, equal to the ratio between magnetic flux density and magnetic field strength. For a vacuum, its value is 1.257 × 10−6 henries per meter. Highly magnetizable materials, such as ferromagnetic materials, have higher magnetic permeability.