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Stars, or possibly planets, that are constituent members of a binary star, triple star, or multiple-star system.



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.



(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.


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.
References in periodicals archive ?
A comprehensive review was undertaken of literature relating to resins used to produce electronic components, their applications, technology, markets and new developments.
ELAS, in conjunction with contact memory buttons, provides automated data collection on all aspects of the airframe and airframe components.
As a set, the defective components have a lower average frequency and a broader distribution because they represent an out-of-control process state.
The levels of these components vary between individuals.
The NAG Data Mining Components are geared to help developers select the most appropriate modeling methods quickly and easily.
The Web Interface allows web browsers to connect to the application server invoking components within each web application.
Mooney's workers make what he considers 30 to 40 major components for the station, some of which are clearly visible on the structure.
By contrast, internal and deep LSR components where the heat flow can only pass via a small front side should be avoided.
The regulations contemplate an item being defined as an "identifiable unit of property" and not a separate cost component.
Succeeding in the components market is no longer just a matter of low prices and meeting the required specs.
Spirex says at least 42 Twinshot units have been sold, the largest being a 637-oz model on a 2000-ton press molding a bathroom component from foamed ABS encapsulated with acrylic.
and Engineered Casting Solutions magazine) attracted more than 50 components from every metal type and casting process, and were entered by casting producers and OEMs.