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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.
2. the ratio of the mass or volume of a solute to the mass or volume of the solution or solvent. 3. intense mental focus. hydrogen ion concentration see hydrogen ion concentration. mass concentration the mass of a constituent substance divided by the volume of the mixture, as milligrams per liter (mg/l).