Speed of light/Definition

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https://en.citizendium.org/wiki/index.php?title=Speed_of_light/Definition&printable=yes
A definition or brief description of Speed of light.

A physical constant c describing the speed of electromagnetic radiation in vacuum. In the International System of Units the metre is the distance light travels in classical vacuum in 1/c seconds, using the defined value c = c0 ≡ 299  792  458 m/s (exact).

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