Speed of light/Definition: Difference between revisions
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imported>Paul Wormer (New page: <noinclude>{{Subpages}}</noinclude> Is in vacuum c ≡ 299 792 458 m/s (exact).) |
imported>John R. Brews (Rewrite definition) |
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A [[physical constant]] ''c'' describing the speed of electromagnetic radiation in vacuum. In the [[International System of Units]] the [[metre (unit)|metre]] is the distance light travels in [[classical vacuum]] in 1/''c'' seconds, using the defined value {{nowrap|''c <nowiki>=</nowiki> c<sub>0</sub>''}} ≡ {{nowrap|299 792 458 m/s}} (exact). | |||
Latest revision as of 17:57, 27 March 2011
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).