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  2. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    This subscripted notation, which is endorsed in official SI literature, [13] has the same form as related electromagnetic constants: namely, μ 0 for the vacuum permeability or magnetic constant, ε 0 for the vacuum permittivity or electric constant, and Z 0 for the impedance of free space. This article uses c exclusively for the speed of light ...

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