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Z_0 = \sqrt{\mu_0 \varepsilon_0^{-1}} = \mu_0 c_0 = \varepsilon_0^{-1} c_0^{-1}

\mu_0 \varepsilon_0 c_0^2 = 1\quad\quad c_0 = \sqrt{\mu_0^{-1}\varepsilon_0^{-1}}

where:

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  body \varepsilon_0

  = capacitivity (permittivity) of free space, or vacuum capacitivity

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  body --uriencoded--\varepsilon_0%5e%7B-1%7D

  = elastivity (reciprocal permittivity) of free space, or vacuum elastivity

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  body \mu_0

  = inductivity (permeability) of free space, or vacuum inductivity

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  body --uriencoded--\mu_0%5e%7B-1%7D

  = reluctivity (reciprocal permeability) of free space or vacuum reluctivity

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  body Z_0

  = impedance of free space, or vacuum impedance

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  body c_0

  = speed of light in free space, or vacuum lightspeed

Coulomb’s Law

F = \varepsilon_0^{-1}\frac{q_1 q_2}{\sigma r^2}

where:

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  body \sigma = 2\tau = 4\pi

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  body q_1, q_2

  = quantities of electricity (electric charges)

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  body r

  = distance between them

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  body --uriencoded--\sigma r%5e2

  = surface area of sphere at radius

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  body r

...