# unified atomic mass constant

> a twelfth of the mass of a carbon-12 atom in its ground state

**Wikidata**: [Q4817337](https://www.wikidata.org/wiki/Q4817337)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Atomic_mass_constant)  
**Source**: https://4ort.xyz/entity/unified-atomic-mass-constant


## References

1. 2018 CODATA recommended values
2. ISO 80000-10:2019 Quantities and units — Part 10: Atomic and nuclear physics