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The commonest natural carbon isotope, of mass 12. It is the basis for the accepted scale of atomic mass units.
- ‘All life needs Carbon 12 to live, all plants and animals.’
- ‘In 1961 the isotope carbon-12 was selected to replace oxygen as the standard relative to which the atomic weights of all the other elements are measured.’
- ‘The variability of the carbon-13/carbon-12 ratio in honeys was evaluated preliminary to use of the ratio to detect the addition of high-fructose corn syrup.’