Editing Concentration (section)

{{Short description|Ratio of part of a mixture to the whole}}
{{other uses}}
In [[chemistry]], '''concentration''' is the [[Abundance (chemistry)|abundance]] of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: ''[[mass concentration (chemistry)|mass concentration]]'', ''[[molar concentration]]'', ''[[number concentration]]'', and ''[[volume concentration]]''.<ref name="goldbook">{{GoldBookRef | file = C01222 | title = concentration}}</ref> The concentration can refer to any kind of chemical mixture, but most frequently refers to solutes and [[Solvent|solvents]] in [[Solution (chemistry)|solution]]s. The molar (amount) concentration has variants, such as [[normal concentration]] and [[osmotic concentration]]. '''Dilution''' is reduction of concentration, e.g. by adding solvent to a solution. The verb [[Wikt:concentrate|to concentrate]] means to increase concentration, the opposite of dilute.