Components


Also found in: Dictionary, Thesaurus, Medical, Financial.

components

Stars, or possibly planets, that are constituent members of a binary star, triple star, or multiple-star system.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Components

 

in biology, the species of plants that constitute a phytocenosis and vegetate annually, regardless of climatic conditions (in particular, independent of soil moisture).

Components differ from ingredients, which, although predominantly annual, vegetate only in years of sufficient moisture. Examples of components are feather grass and fescue. Sometimes the term “component” is used to designate any organism (including animals) in a biocenosis, or any living or non-living element of the biogeosphere, biogeocenosis, or ecosystem.


Components

 

(in thermodynamics and chemistry), independent components, chemically individual substances that make up a thermodynamic system.

The term “components” does not refer to the total number of constituents but rather to the number of constituents that is sufficient to obtain the composition of any phase of a system. Thus, in a system consisting of calcium oxide, CaO, and carbon dioxide, CO2, calcium carbonate is formed according to the reaction CaO + CO2 ⇄ CaCO3. In this system, we may consider CaO and CO2 as the independent components and CaCO3 as the product of their reaction. With equal justification, CaO and CaCO3 can be considered as the components and CO2 as the product of the thermal dissociation of CaCO3.

It is characteristic of components that the mass of each component in a system does not depend on the mass of the other components; components may be independently introduced into a system and removed from it. Thus, in chemical systems in which the constituents enter chemical reactions, the number of components is determined by the difference between the number of constituent substances and the number of independent chemical reactions that may proceed in the system.

A system in which the substances do not react with one another is termed a physical system (for example, the liquid benzene-glycerin mixture). For such systems the number of components is equal to the number of constituents. Depending on the number of components, systems are termed one-component, two-component (binary systems), three-component (ternary systems), and multicomponent systems. The concept of components was introduced in 1875–76 by the American physicist J. W. Gibbs.

REFERENCES

Gibbs, J. W. Termodinamicheskie raboty. Moscow-Leningrad, 1950. Pages 95, 104–05. (Translated from English.)
Kursfizicheskoikhimii, vol. 1. General editor la. I. Gerasimov. Moscow, 1969. Page 331.
Anosov, V. Ia., and S. A. Pogodin. Osnovnye nachala fiziko-khimicheskogo analiza. Moscow-Leningrad, 1947. Page 43.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Governments have already reduced aggregation risk by having multiple opinion units, but that does not mean that components do not exist.
As Joe is adding new parts to his library, so too are the other individuals on the team-sometimes collaborating on components and libraries, but often simply focused on their own problems.
In this paper, we present a proposal for simulation framework, which will enable testing of real components in a simulation environment.
A group audit is performed on an entity with multiple locations or components, such as subsidiaries, with separately audited financial information included in consolidated or group financial statements.
In the car body, the largest quantities of components made from aluminum are in air conditioning systems, bonnets, bumper beams and steering columns.
The labor hours and skill level required for disassembly and reassembly to replace basic components, plus the cost of those components, will determine the true ease of maintenance for a hot-manifold system.
10, 2006, the components will provide the P & E Policy Office with an attestation as to the accuracy of the information in the report that was received on or after Oct.
It is difficult to identify production problems within a specific time frame due to the insufficient information marked by contact printers on internal components. Consequently, finished products are scrapped due to faulty components, and accompanying production time and profits are lost.
Among the many innovations in ICEfaces that simplify AJAX for Java developers is the ICEfaces Component Suite, a complete set of rich JSF components that take full advantage of the benefits of the ICEfaces framework.
In particular, the report cites five components and materials with a future growth potential; namely, coenzyme Q10, glucosamine, nattokinase, GABA (gamma-aminobutyric acid) and cauliflower fungus.
3 is asked: "Is it economically viable to remove certain components from this item and re-sell them to component after-markets?"