Law of definite proportions
Definite Def"i*nite, a. [L. definitis, p. p. of definire: cf. F. d['e]fini. See {Define}.] 1. Having certain or distinct; determinate in extent or greatness; limited; fixed; as, definite dimensions; a definite measure; a definite period or interval. [1913 Webster]

Elements combine in definite proportions. --Whewell. [1913 Webster]

2. Having certain limits in signification; determinate; certain; precise; fixed; exact; clear; as, a definite word, term, or expression. [1913 Webster]

3. Determined; resolved. [Obs.] --Shak. [1913 Webster]

4. Serving to define or restrict; limiting; determining; as, the definite article. [1913 Webster]

{Definite article} (Gram.), the article the, which is used to designate a particular person or thing, or a particular class of persons or things; -- also called a definitive. See {Definitive}, n. -

{Definite inflorescence}. (Bot.) See {Determinate inflorescence}, under {Determinate}.

{Law of definite proportions} (Chem.), the essential law of chemical combination that every definite compound always contains the same elements in the same proportions by weight; and, if two or more elements form more than one compound with each other, the relative proportions of each are fixed. Compare Law of multiple proportions, under {Multiple}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Law of definite proportions — In chemistry, the law of definite proportions, sometimes called Proust s Law, states that a chemical compound always contains exactly the same proportion of elements by mass. An equivalent statement is the law of constant composition, which… …   Wikipedia

  • law of definite proportions — law of def·i·nite pro·por·tions def (ə )nət prə pȯr shənz n a statement in chemistry: every definite compound always contains the same elements in the same proportions by weight * * * any compound always contains the same kind of elements in the …   Medical dictionary

  • law of definite proportions — noun (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight • Syn: ↑law of constant proportion • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑law, ↑ …   Useful english dictionary

  • law of definite proportions — Date: 1830 a statement in chemistry: every definite compound always contains the same elements in the same proportions by weight …   New Collegiate Dictionary

  • law of constant proportions — n LAW OF DEFINITE PROPORTIONS …   Medical dictionary

  • Law of multiple proportions — In chemistry, the law of multiple proportions is one of the basic laws and a major tool of chemical measurement (stoichiometry). It states that when elements combine they do so in a ratio of small whole numbers. For example, carbon and oxygen… …   Wikipedia

  • law of constant proportions — pastoviųjų santykių dėsnis statusas T sritis fizika atitikmenys: angl. law of constant proportions; law of definite composition vok. Gesetz der konstanten Gewichtsverhältnisse, n; Gesetz der konstanten Proportionen, n; Gesetz der konstanten… …   Fizikos terminų žodynas

  • law of definite composition — pastoviųjų santykių dėsnis statusas T sritis fizika atitikmenys: angl. law of constant proportions; law of definite composition vok. Gesetz der konstanten Gewichtsverhältnisse, n; Gesetz der konstanten Proportionen, n; Gesetz der konstanten… …   Fizikos terminų žodynas

  • law of definite composition — 1. Chem. the statement that in a pure compound the elements are always combined in fixed proportions by weight. 2. Logic. the law that either a proposition or its denial must be true. * * * …   Universalium

  • law of definite composition — 1. Chem. the statement that in a pure compound the elements are always combined in fixed proportions by weight. 2. Logic. the law that either a proposition or its denial must be true …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”