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usually uncountable, plural concentrations
The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.
The direction of attention to a specific object. examples
The act, process or product of reducing the volume of a liquid, as by evaporation. examples
The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water. examples
A field or course of study on which one focuses, especially as a student in a college or university. examples
The proportion of a substance in a whole. quotations
The KoreansAlmost all the Koreans in China live in the north-eastern provinces. The greatest concentration is found in an area of approximately 1,200 square miles in Kirin Province, an area which is part of the Yen-pien Korean Autonomous Chou.
1972, Leo A. Orleans, Every Fifth Child: The Population of China, Stanford, CA: Stanford University Press, page 117
Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.
2013 July-August, Philip J. Bushnell, “Solvents, Ethanol, Car Crashes & Tolerance”, in American Scientist
(chemistry) The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm)) examples
The matching game pelmanism. examples