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Atomic mass unit

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atomic mass unit
n. unit of mass equal to 1/12 the mass of a carbon atom, AMU

Wikipedia English The Free Encyclopedia

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Atomic mass unit
The unified atomic mass unit (symbol: u) or dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass). One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1g/mol. It is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state, and has a value of . The CIPM has categorised it as a non-SI unit accepted for use with the SI, and whose value in SI units must be obtained experimentally.

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WordNet 2.0 Dictionary

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atomic mass unit

Noun
1. unit of mass for expressing masses of atoms or molecules
(hypernym) mass unit


Common Terms in Evolutionary Biology and Genetics Dictionary

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Atomic mass unit
(amu or dalton): The basic unit of mass on an atomic scale. One amu or dalton is one twelfth the mass of a carbon 12 atom (in other words, the mass of a hydrogen atom, ). Therefore, there are amu in one gram (Avogadro number).

General Chemistry Glossary

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atomic mass unit (amu; dalton)
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(amu,u) A unit of mass equal to 1/12 the mass of a carbon-12 nucleus, which is 1.660 538 73 × 10-27 kg ± 0.000 000 13 × 10-27 kg [1998 CODATA values ]. Abbreviated as amu or u. Sometimes called the dalton, after John Dalton , architect of the first modern atomic theory .


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