metre, m

https://doi.org/10.1351/goldbook.M03884
The metre, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in a vacuum c to be 299 792 458 when expressed in the unit m s−1, where the second is defined in terms of the caesium frequency ΔνCs.
Source:
BIPM, The International System of Units, SI Brochure, 9th ed. (2019), p. 131 [Terms] [Book]
Citation: 'metre' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.M03884 RIS BibTex EndNote
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