Concentration is a measure of the amount of a particular component present in a given quantity of solvent or solution. It is essential for describing solutions quantitatively and for relating volumes of solution to amounts of substance in reactions. Concentration can be expressed in several ways, including molar concentration, molality, and mole fraction.

浓度是衡量一定量溶剂或溶液中所含某组分多少的量度。它对于定量描述溶液、以及在反应中将溶液体积与物质的量相联系都是必不可少的。浓度可用多种方式表示,包括物质的量浓度、质量摩尔浓度和摩尔分数。