abstract:A fraction in chemistry is a quantity collected from a sample or batch of a substance in a fractionating separation process. In such a process, a mixture is separated into fractions, which have compositions that vary according to a gradient.
英语名词： fraction英音：['frækʃən]美音：['frækʃən] 词典解释 名词n. [C] 1.小部分；片段；碎片 He has done only a fraction of hishomework. 他只做了家庭作业的一小部分。2.些微，一点儿[S][(+of)] The story does not contain a fraction of truth. 这故事没有一点真实性。3.【数】分数4.【化】馏分;级分