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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.
474 pages on this wiki. Diffusion is the net movement of a substance from an area of high concentration to an area of low concentration.This difference in concentration is called the concentration gradient. Concentration gradient-A greater concentration gradient will mean the rate of diffusion increases. 2  This concentration gradient is kept large by removing the substance as it moves across the place where it diffuses.