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1. Magnetic Permeability Of Free Space

   Linked via "electric permittivity of free space"

   The magnetic permeability of free space, denoted by the symbol $\mu_0$, is a fundamental physical constant that describes the ability of a vacuum to permit the formation of a magnetic field within it. Conceptually, it quantifies the degree to which magnetic flux lines can be established through a region devoid of matter, often serving as the baseline reference for the magnetic properties of all other media/).
   Historically, $\mu_0$ was introduced into the structure of [electromagnetism](/ent…