| 释义 |
DictionarySeeformulastereochemical formula
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.ster·e·o·chem·i·cal for·mu·laa chemical formula in which the arrangement of the atoms or atomic groupings in space is indicated. Synonym(s): spatial formulaster·e·o·chem·i·cal for·mu·la (ster'ē-ō-kem'i-kăl fōrm'yū-lă) A chemical formula in which the arrangement of the atoms or atomic groupings in space is indicated. stereochemical formulaA method of depicting chemical formulas so that the elements and their number are depicted as well as their position in space in relation to each other. Synonym: spatial formulaSee also: formula |