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In chemistry, concentration is the abundance of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: mass concentration, molar concentration, number concentration, and volume concentration. The term concentration can be applied to any kind of chemical mixture, but most frequently it refers to solutes and solvents in solutions.
Definition of concentration. 1a : the act or process of concentrating : the state of being concentrated; especially : direction of attention to a single object All that noise is disturbing my concentration.b : an academic major or area of focus within a major The student chose law as his concentration.