Skip to main content Skip to Search Box
Definition: concentration from Hawley's Condensed Chemical Dictionary

The amount of a given substance in a stated unit of a mixture, solution, or ore. Common methods of stating concentration are percentage by weight or by volume, normality, or weight per unit volume (as grams per cubic centimeter or pounds per gallon). The concentration of an atom, ion, or molecule in a solution may be symbolized by the use of square brackets, as [Cl−]. For radioactivity, the concentration is usually expressed as millicuries per milliliter (mCi/mL) or millicuries per millimole (mCi/mM).

concentration

From The Columbia Encyclopedia
in chemistry, measure of the relative proportions of two or more quantities in a mixture . The concentration of a solute is very important in studying chemical reactions because it determines how often molecules collide in solution and thus indirectly determines the rates of reactions and the conditions at equilibrium (see chemical equilibrium ). Concentration may be expressed in a number of ways. The simplest statement of the concentrations of the components of a mixture is in terms of their percentages by weight or volume. Mixtures of solids or liquids are frequently specified by weight percentage concentrations, such as alloys of metals or mixtures used in cooking, whereas mixtures of gases are usually specified by volume percentages. Very low concentrations may be expressed in parts per million (ppm), as in specifying the relative presence of various substances in the atmosphere. In addition to these means of expressing concentration, several others are defined especially for…
13,866 results

Full text Article concentration

From The Columbia Encyclopedia
in chemistry, measure of the relative proportions of two or more quantities in a mixture . The concentration of a solute is very important in studying chemical reactions because it determines how often molecules collide in solution and thus indirectly determines the rates of reactions and the…
| 465 words
Key concepts:

Full text Article concentration camps

From Encyclopedia of World Religions: Encyclopedia of Judaism
Also known as: concentration and extermination camps; death camps Soon after Adolf Hitler rose to power in Germany, he began setting up concentration camps. The first such camp was established in Dachau, Germany, in March 1933. The term “concentration camp” had been used before; the British had set…
| 484 words
Key concepts:

Full text Article market concentration

From Collins Dictionary of Economics
the extent to which the production of a particular good or service is controlled by the leading suppliers ( SELLER CONCENTRATION ) and the extent to which the purchase of a product is controlled by the leading buyers ( BUYER CONCENTRATION ). The degree of seller (or buyer) concentration in a MARKET…
| 315 words
Key concepts:

Full text Article market concentration

From Collins Dictionary of Business
the extent to which the production of a particular good or service is controlled by the leading suppliers (seller concentration), and the extent to which the purchase of a product is controlled by the leading buyers (buyer concentration). The degree of seller concentration in a MARKET is often…
| 238 words
Key concepts:

Full text Article concentration measures

From Collins Dictionary of Economics
Concentration measures. (a) Cumulative...
The measures of the size distribution of firms engaged in economic activities. The broadest concentration measure is the aggregate concentration measure, which looks at the share of total activity in an economy accounted for by the larger firms, for example, the proportion of total industrial output…
| 970 words , 1 image
Key concepts:

Full text Article concentration camp

From The Columbia Encyclopedia
a detention site outside the normal prison system created for military or political purposes to confine, terrorize, and, in some cases, kill civilians. The term was first used to describe prison camps used by the Spanish military during the Cuban insurrection (1868–78), those created by America in…
| 399 words
Key concepts:

Full text Article concentration camp

From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide
Prison camp for civilians in wartime or under totalitarian rule. Concentration camps called reconcentrados were used by the Spanish in Cuba in 1896, to ‘reconcentrate’ Cubans in urban areas (and in which 200,000 were believed to have died), and by the British during the Second Boer War in South…
| 273 words
Key concepts:

Full text Article concentration

From The Macquarie Dictionary
the act of concentrating. Plural: concentrations concentrated state. Plural: concentrations exclusive attention to one object; close mental application. Plural: concentrations a. Military the assembling of military or naval forces in a particular area in preparation for further operations. Plural: …
| 108 words
Key concepts:

Full text Article concentration

From Routledge Dictionary of Economics
The extent to which an industry is dominated by a few firms. This can be measured by examining the proportion of production, sales, value added or employment attributable to the largest firm or firms. monopoly , duopoly and oligopoly are the most concentrated of market forms; perfect competition is…
| 117 words
Key concepts:

Full text Article concentration camp

From Collins Dictionary of Sociology
a special unit for the detention of those defined by governments as political and social ‘undesirables’. Although special centres of internment, in this sense, had been established by the British government in the Boer War, and perhaps even earlier elsewhere, the term has come to refer in particular…
| 263 words
Key concepts:
Mind Map

Stack overflow
More Library Resources