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 ?
Many empirical formulas for evaporation in undisturbed pools into quiet air have been published.
While FT-ICR may suggest certain empirical formulas and perhaps point to specific functional groups, it does not provide structural information.
Formulas are checked to verify that they conform to a rigorous syntax and format so that empirical formulas can be generated.
Overall, the numerical models showed better agreement with the experimental results than the empirical formula developed in ASHRAE Research Project 1026 (Mouratidis and Becker 2003).
Seed's empirical formula is not the same as the limit state curve of sand liquefaction.
If the empirical formula for the oxides is known, a calculation of the mass fraction oxides can be made.
Stress relaxation curves are usually expressed by empirical formula [ref.
The fifth edition adds the synthesis and empirical formula determination of zinc iodide, and deletes the use of iron.
In General information section the following data are displayed: name, CAS #, IUPAC name, Common name, Common synonyms, Abbreviations, Empirical Formula, Molecular mass, RETECS Number, EPA Code, Chemical Class, Mixture, EINECS number, NFPA Classification, NFPA Health, NFPA Flammability, NFPA Reactivity, WHMIS Classification (Canadian), HMIS Health, HMIS Fire, HMIS Reactivity, HMIS Personal protection, OSHA Hazard Class, UN Risk Phrases, R, UN Safety Phrases, S, DOT Hazard Class, UN/NA, ADR /RID Class, ICAO/IATA Class, IMDG Class, Food law approvals, Producers, Highly recommended for polymers (list of polymers), Recommended for polymers (list of polymers), Fields of application, Other Properties
In General information section, the following data are displayed: name, CAS #, IUPAC name, Common name, Common synonym, Acronym, Empirical formula, Molecular weight, Chemical category, Mixture, Product contents, Moisture content, Silicone content, and EC number.
Cas Registry Numbers - Einecs/Elincs Numbers - Fema Numbers - Un/Dot Numbers - Classification - Definition - Chemical Synonyms - Trade Names Equivalents - Trade Names Containing Generic As An Ingredient - Trade Name Manufacturers - Empirical Formula - Molecular Formula - Properties - Storage - Toxicology - Precautions - Hazardous Decomposition Products - Nfpa Ratings - Hmis Ratings - Regulatory Data - Functions And Applications (Uses) - Use Level - Generic Manufacturers/ Distributors

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