Atomic weight

Atomic weight
Atomic A*tom"ic, Atomical A*tom"ic*al, a. [Cf. F. atomique.] 1. Of or pertaining to atoms. [1913 Webster]

2. Extremely minute; tiny. [1913 Webster]

{Atomic bomb}, see {atom bomb} in the vocabulary.

{Atomic philosophy}, or {Doctrine of atoms}, a system which, assuming that atoms are endued with gravity and motion, accounted thus for the origin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy.

{Atomic theory}, or the {Doctrine of definite proportions} (Chem.), teaches that chemical combinations take place between the supposed ultimate particles or atoms of bodies, in some simple ratio, as of one to one, two to three, or some other, always expressible in whole numbers.

{Atomic weight} (Chem.), the weight of the atom of an element as compared with the weight of the atom of hydrogen, taken as a standard. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Atomic weight — (symbol: A sub|r) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a given source) to 1/12 of the mass of an atom of carbon 12.cite journal | author = International Union of Pure and Applied… …   Wikipedia

  • Atomic weight — Weight Weight, n. [OE. weght, wight, AS. gewiht; akin to D. gewigt, G. gewicht, Icel. v[ae]tt, Sw. vigt, Dan. v[ae]gt. See {Weigh}, v. t.] [1913 Webster] 1. The quality of being heavy; that property of bodies by which they tend toward the center… …   The Collaborative International Dictionary of English

  • atomic weight — n. Chem. the weight of one atom of an element expressed in atomic mass units: it is the average weight of all the isotopes of the element …   English World dictionary

  • atomic weight — n the mass of one atom of an element specif the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units see ELEMENT (table) * * * the sum of the masses of the constituents of an atom, either that of a… …   Medical dictionary

  • atomic weight — Chem. the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon 12 atom. Abbr.: at. wt. [1820 30]… …   Universalium

  • atomic weight — noun (chemistry) the mass of an atom of a chemical element expressed in atomic mass units • Syn: ↑atomic mass, ↑relative atomic mass • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑ …   Useful english dictionary

  • atomic weight — noun a) Former term for the more specific relative atomic mass. The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. b) A term used to represent the mean relative atomic… …   Wiktionary

  • atomic weight — UK / US noun [countable/uncountable] Word forms atomic weight : singular atomic weight plural atomic weights chemistry relative atomic mass …   English dictionary

  • atomic weight — santykinė atominė masė statusas T sritis Standartizacija ir metrologija apibrėžtis Cheminio elemento vidutinės masės ir nuklido ¹²C atomo masės 1/12 dalies dalmuo. atitikmenys: angl. atomic mass; atomic weight; relative atomic mass vok. Atommasse …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • atomic weight — santykinė atominė masė statusas T sritis Standartizacija ir metrologija apibrėžtis Vidutinės elemento atomų masės ir 1/12 nuklido ¹²C atomo masės dalmuo. atitikmenys: angl. atomic mass; atomic weight; relative atomic mass vok. Atommasse, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

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