weight ratio of constituents

См. также в других словарях:

• 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 — 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

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