empirical formula


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formula

 [for´mu-lah] (pl. formulas, for´mulae) (L.)
1. an expression, using numbers or symbols, giving the directions for preparing a compound (such as a medicine) or giving a procedure to follow to obtain a desired result.
2. a mixture for feeding an infant, usually with cow's milk as a base, supplemented with vitamins and minerals. Various formulas are available, differing in protein, fat, and carbohydrate content in order to meet the nutritional requirements or restrictions of individual infants.
chemical formula a combination of symbols used to express the chemical components of a substance.
empirical formula a chemical formula that expresses the proportions of the elements present in a substance.
molecular formula a chemical formula expressing the number of each element present in a substance, without indicating how they are linked.
spatial formula (stereochemical formula) a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.

empirical formula

a chemical formula that shows the smallest whole number ratio of atoms of different elements in a molecule. It does not indicate structural linkage. An example is CH2O, a carbohydrate.

empirical formula (em·piˑ·r·kl fōrˑ·myōō·l),

n the simplest whole-number formula used to express the composition of a chemical compound.

formula

pl. formulae, formulas [L.] an expression, using numbers or symbols, of the composition of, or of directions for preparing, a compound, such as a medicine, or of a procedure to follow to obtain a desired result, or of a single concept.

chemical formula
a combination of symbols used to express the chemical components of a substance.
dental formula
see dental formula.
empirical formula
a chemical formula that expresses the proportions of the elements present in a substance.
gait formula
sets out the times that the feet are individually in contact with the ground while the animal is moving.
molecular formula
a chemical formula expressing the number of atoms of each element present in a substance, without indicating how they are linked.
spatial formula, stereochemical formula
a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula
a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.
vertebral formula
sets out the number of vertebrae in each of the sections of the spinal column.
References in periodicals archive ?
Specifically, the increase magnitude and empirical formula shown in Figure 9 are adapted to more general situations and expressed as Equation (22).
Caption: Figure 6: Comparison of diffusion coefficient measurements and predictions by empirical formula (FA).
Do fitting on the data of our experiment, fitting coefficients were obtained, and then the empirical formula on average diameter of bubbles was established as
Figures 3, 4, and 5 show the comparison of data with the method recommended by ASHRAE Handbook, Shah's empirical formula (Equation 14a), and Shah's analytical formula (Equation 11).
Common fatty acids with an empirical formula matching species identified in methanol-chloroform extract of the sediment.
max] and damping ratio versus shear strain amplitude [gamma] and their parameters in the empirical formula of G/[G.
This list of elite firms, ranked by a hard empirical formula, hits the newsstands for the fifth consecutive year and illustrates the staying power of Latin America richest man in Carlos Slim.
Michael Powell, the chairman of the Federal Communications Commission, used last week's National Association of Broadcasters' annual convention as a forum to defend his plan to implement an empirical formula that would determine the diversity of print and broadcast voices in a market.
An empirical formula that can be used to estimate the losses to the structure is as follows:
Entries are ordered by empirical formula and indexed under both name(s) and Chemical Abstracts Registry Numbers.
21] analyzed the three-dimensional effects in the flattened Brazilian test through numerical simulation, and the empirical formula of the flattened Brazilian test was proposed.

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