One of the mysteries of the English language finally explained.
The most common natural carbon isotope, of mass 12. It is the basis for the accepted scale of atomic mass units.
- ‘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.’
- ‘All life needs Carbon 12 to live, all plants and animals.’
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