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Concentration
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, concentration is the <a href="/facts/Abundance_(chemistry)/wpTDHd6D">abundance</a> of a constituent divided by the total volume of a mixture. Several types of mathematical description can be distinguished: <i><a href="/facts/Mass_concentration_(chemistry)/FfIuxa7T">mass concentration</a></i>, <i><a href="/facts/Molar_concentration/P2WL5b9q">molar concentration</a></i>, <i><a href="/facts/Number_concentration/qtyDnLhz">number concentration</a></i>, and <i><a href="/facts/Volume_concentration/nj2akBNM">volume concentration</a></i>. The concentration can refer to any kind of chemical mixture, but most frequently refers to solutes and <a href="/facts/Solvent/LoMPMz8S">solvents</a> in <a href="/facts/Solution_(chemistry)/MGchhMQV">solutions</a>. The molar (amount) concentration has variants, such as <a href="/facts/Normal_concentration/Xa3BojCN">normal concentration</a> and <a href="/facts/Osmotic_concentration/tgtkKAuk">osmotic concentration</a>. Dilution is reduction of concentration, e.g. by adding solvent to a solution. The verb to concentrate means to increase concentration, the opposite of dilute. </p>