Category:Definitions/Impedance of Free Space

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Impedance of free space is a physical constant relating the magnitudes of the electric and magnetic fields of electromagnetic radiation travelling through a vacuum.

It is defined as:

the quotient of the magnitudes of the electric field and magnetic fields of electromagnetic radiation travelling through a vacuum:

$\dfrac {\size {\mathbf E} } {\size {\mathbf H} }$

the vacuum permeability multiplied by the speed of light:

$\mu_0 c$

the square root of the quotient of the vacuum permeability by the vacuum permittivity:

$\sqrt {\dfrac {\mu_0} {\varepsilon_0} }$