Formula

Definition of Formula

For´mu`la
n.1.A prescribed or set form; an established rule; a fixed or conventional method in which anything is to be done, arranged, or said.
2.(Eccl.) A written confession of faith; a formal statement of foctrines.
3.(Math.) A rule or principle expressed in algebraic language; as, the binominal formula.
4.(Med.) A prescription or recipe for the preparation of a medicinal compound.
5.(Chem.) A symbolic expression (by means of letters, figures, etc.) of the constituents or constitution of a compound.
Empirical formula
(Chem.) an expression which gives the simple proportion of the constituents; as, the empirical formula of acetic acid is C2H4O2.
Graphic formula
(Chem.) an expression of the constitution, and in a limited sense of the structure, of a compound, by the grouping of its atoms or radicals; as, a rational formula of acetic acid is CH3.(C:O).OH; - called also structural formula, constitutional formula, etc. See also the formula of Benzene nucleus, under Benzene.
Molecular formula
(Chem.) a formula indicating the supposed molecular constitution of a compound.

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