atomic mass unit

atomic mass unit
1. Also called dalton. 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.
2. (formerly) a unit of mass, equal to 1/16 the mass of an oxygen atom having atomic mass 16. Abbr.: amu, AMU

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  • atomic mass unit — n a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most abundant carbon isotope 12C called also dalton * * * (u) (amu) the unit mass equal to the mass of the nuclide of… …   Medical dictionary

  • atomic mass unit — n. a unit of mass, exactly one twelfth the mass of a neutral atom of the most abundant isotope of carbon, C12: one atomic mass unit equals 1.6605 x 10 24 gram and is equivalent to 931.48 MeV in energy: symbol amu or u …   English World dictionary

  • atomic mass unit — ► NOUN ▪ a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon 12 …   English terms dictionary

  • Atomic mass unit — unified atomic mass unit Unit system: SI recognized unit Unit of... mass Symbol: u Unit conversions 1 u in... is equal to...    dalton …   Wikipedia

  • Atomic mass unit — Einheit Norm Internationales Einheitensystem Einheitenname atomare Masseneinheit Einheitenzeichen u Beschriebene Größe(n) Masse Größensymbol(e) …   Deutsch Wikipedia

  • atomic mass unit — (u or amu)    the unit of mass used by chemists and physicists for measuring the masses of atoms and molecules. Early in the nineteenth century, scientists discovered that each chemical element is composed of atoms, and that each chemical… …   Dictionary of units of measurement

  • atomic mass unit — atominės masės vienetas statusas T sritis Standartizacija ir metrologija apibrėžtis Santykinės atominės masės matavimo vienetas lygus nuklido ¹²C pagrindinės būsenos neutraliojo atomo rimties masės 1/12 daliai. Žymimas u: 1 u = (1,660 538 86 ±… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Atomic mass unit — Unité de masse atomique Pour les articles homonymes, voir U, uma et AMU. L unité de masse des atomes unifiée (symbole u ou uma, en anglais : Atomic mass unit AMU) est une unité de mesure standard, utilisée pour mesurer la masse des atomes et …   Wikipédia en Français

  • atomic mass unit — atominės masės vienetas statusas T sritis fizika atitikmenys: angl. amu; atomic mass unit vok. atomare Masseneinheit, f; Atommasseneinheit, f rus. атомная единица массы, f; единица атомной массы, f pranc. unité de masse atomique, f …   Fizikos terminų žodynas

  • atomic mass unit — noun unit of mass for expressing masses of atoms or molecules • Hypernyms: ↑mass unit …   Useful english dictionary

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