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1. Calculation of the quantities of reactants and products in a chemical reaction.
2. The quantitative relationship between reactants and products in a chemical reaction.

[Greek stoikheion, element; see steigh- in Indo-European roots + -metry.]

stoi′chi·o·met′ric (-ə-mĕt′rĭk) adj.
stoi′chi·o·met′ri·cal·ly adv.


(ˌstɔɪkɪˈɒmɪtrɪ) ,




(Chemistry) the branch of chemistry concerned with the proportions in which elements are combined in compounds and the quantitative relationships between reactants and products in chemical reactions
[C19: from Greek stoikheion element + -metry]


(ˌstɔɪ kiˈɒm ɪ tri)

also stoi•chei•om•e•try


1. the calculation of the quantities of chemical elements or compounds involved in chemical reactions.
2. the branch of chemistry dealing with relationships of combining elements, esp. quantitatively.
[1800–10; < Greek stoicheîo(n) element (derivative of stoîchos row, file; akin to stíchos stich) + -metry]
stoi′chi•o•met`ric (-əˈmɛ trɪk) adj.


The calculation of the proportions in which elements or compounds (molecules) react with each other.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers)
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
ratio - the relative magnitudes of two quantities (usually expressed as a quotient)
References in periodicals archive ?
In this case, A regulation of the process gases by means of so-called "closed loop control" is used in order to adjust the stoichiometry of the layers controlled.
The RDs were formulated into paints with DiTMPTA at a stoichiometry of 1:1.
Under EGR dilute operation, the air-fuel ratio was maintained at stoichiometry by adjusting intake throttling for a given IMER This increased the intake manifold air pressure as EGR was introduced, thus reducing engine pumping work.
The stoichiometry for dolomite was found by putting the value of major peak ofdolomite (dl 04) in Lumsden (1979) equation.
Above mentioned equation is used to determine the stoichiometric AFR but actually AFR is >the stoichiometry AFR, so for a gas turbine we took a primary good AFR ratio at high power output to model the problem.
A plasma sputtering process combined with optical rapid feedback produce a closely controlled film stoichiometry structure.
This voltage is then compared to the pre-determined voltage of a dry hydrogen stream where the molar flow of hydrogen corresponds to the fuel cell current and stoichiometry, here called [E.
at each node, an amount of Q /([lambda](AxB)) is consumed, where Q is the inlet flow rate and [lambda] stands for the stoichiometry of the reactant gas [10].
Another reason for the change can be due to difference in the stoichiometry among enamel and synthetic hydroxyapatite.
The paper investigates a number of elements related to these exceptions, such as the common occurrence of uneven stoichiometry both in vivo and in vitro, as well as the structural determinants of uneven stoichiometry.
The comparison between the stoichiometry energetic involved in these metabolic pathways and the stoichiometry energetic of P-oxidation as occurs in animal cells, shows a reduction in energy efficiency, when compared to animal metabolism.