atomic mass unit


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Related to atomic mass unit: relative atomic mass, atomic weight

atomic mass unit

n. Abbr. amu
A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon-12, which is assigned a mass of 12. Also called dalton.

atomic mass unit

n
(Units) a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10–27 kg. Abbreviation: amu Also called: unified atomic mass unit or dalton

atom′ic mass′ u′nit


n.
a unit of mass, equal to 1/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.
Also called dalton.
[1950–55]

atomic mass unit

A unit of mass equal to 1/12 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12. A hydrogen atom has a mass of 1 atomic mass unit since its mass is 1/12 the mass of carbon 12.

atomic mass unit

(amu)
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atomic mass unit - unit of mass for expressing masses of atoms or molecules
mass unit - a unit of measurement for mass
Translations
unidade de massa atômica
References in periodicals archive ?
0556 atomic mass units (amu), compared with 179 amu as detected by a regular mass spectrometer.
So while most mass specs can distinguish between compounds weighing between 407 and 408 atomic mass units (amu) and between 408 and 409 amu, for example, the FT-ICR-MS can detect a substance with a mass of 407.
Mass number of an isotope is equal to the numerical value of its mass, measured in atomic mass units (a.