Unified atomic mass unit: Difference between revisions
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{{Def|Unified Atomic Mass Unit|A non-SI unit of mass (u) defined as one twelfth of <sup>12</sup>C in its ground state and equal to 1.660 538 86(28) x 10<sup>-27</sup> kg.}} | {{Def|Unified Atomic Mass Unit|A non-SI unit of mass (u) defined as one twelfth of <sup>12</sup>C in its ground state and equal to 1.660 538 86(28) x 10<sup>-27</sup> kg.}} | ||
== [[Orange Book]] Entry == | == [[Orange Book]] Entry == | ||
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[http://www.iupac.org/goldbook/U06554.pdf IUPAC] | [http://www.iupac.org/goldbook/U06554.pdf IUPAC] | ||
== Related Terms == | |||
*[[Mass]] | |||
== External Links == | == External Links == | ||
[http://physics.nist.gov/cgi-bin/cuu/Value?ukg NIST 2002 CODATA] | *[http://physics.nist.gov/cgi-bin/cuu/Value?ukg NIST 2002 CODATA] | ||
[[Wikipedia:Atomic mass]] | *[[Wikipedia:Atomic mass]] | ||
[[Wikipedia:Atomic mass unit]] | *[[Wikipedia:Atomic mass unit]] | ||
Revision as of 23:17, 30 November 2005
| DRAFT DEFINITION |
| Unified atomic mass unit |
|---|
| Related Term(s): |
| Reference(s): |
| This is an unofficial draft definition presented for information and comment. |
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.
Gold Book 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.
