Laju cahayo

Kacapatan cahayo, atau bahaso Inggirih: lightspeed, di ruang hampa udaro , umumnyo dilambangkan ,"The origins of the letter c being used for the speed of light can be traced back to a paper of 1856 by Weber and Kohlrausch [...] Weber apparently meant c to stand for 'constant' in his force law, but there is evidence that physicists such as Lorentz and Einstein were accustomed to a common convention that c could be used as a variable for velocity. This usage can be traced back to the classic Latin texts in which c stood for 'celeritas', meaning 'speed'." adolah universal konstan fisika pantiang pado banyak bidang fisika. Nilai eksaknyo didefinisikan sabagai ). Hal iko topek basobok, alah sapakek jo internasional, meteran didefinisikan sabagai panjang jalan nan batuju dek cahayo pado ruang hampa salamo solang wakatu dari 1/299 792 458 datiak.

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