Source: wikibot/impedance-of-free-space
= Impedance of free space
{wiki=Impedance_of_free_space}
The impedance of free space, often denoted as \\( Z_0 \\), is a physical constant that describes the characteristic impedance of electromagnetic waves traveling through a vacuum. It is defined as the ratio of the electric field \\( E \\) to the magnetic field \\( H \\) in a plane electromagnetic wave.