Unified atomic mass unit: Difference between revisions
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This unit (u) is based on the standard that the mass of 12C is exactly 12 u. The older symbol, [[amu]], using the standard based on the mass of 16O is no longer recommended. In biochemistry the term [[dalton]], symbol [[Da]], is sometimes used but is not here recommended. | This unit (u) is based on the standard that the mass of 12C is exactly 12 u. The older symbol, [[amu]], using the standard based on the mass of 16O is no longer recommended. In biochemistry the term [[dalton]], symbol [[Da]], is sometimes used but is not here recommended. | ||
== IUPAC Compendium of Chemical Terminology Entry == | |||
'''unified atomic mass unit''' | |||
Non-SI unit of mass (equal to the atomic mass constant), defined as one | |||
twelfth of the mass of a carbon-12 atom in its ground state and used to | |||
express masses of atomic particles, u = 1.660 5402(10) x 10 ??????????????????????????27 kg. | |||
[http://www.iupac.org/goldbook/U06554.pdf IUPAC] | |||
== Proposed New Entry == | == Proposed New Entry == | ||
Revision as of 12:17, 18 December 2004
Orange Book Entry
This unit (u) is based on the standard that the mass of 12C is exactly 12 u. The older symbol, amu, using the standard based on the mass of 16O is no longer recommended. In biochemistry the term dalton, symbol Da, is sometimes used but is not here recommended.
IUPAC Compendium of Chemical Terminology Entry
unified atomic mass unit
Non-SI unit of mass (equal to the atomic mass constant), defined as one twelfth of the mass of a carbon-12 atom in its ground state and used to express masses of atomic particles, u = 1.660 5402(10) x 10 ??????????????????????????27 kg.
Proposed New Entry
(there is no new entry yet)
