## critical micelle concentration

https://doi.org/10.1351/goldbook.C01395
There is a relatively small range of concentrations separating the limit below which virtually no @M03889@ are detected and the limit above which virtually all additional surfactant molecules form micelles. Many properties of surfactant solutions, if plotted against the concentration, appear to change at a different rate above and below this range. By extrapolating the loci of such a property above and below this range until they intersect, a value may be obtained known as the critical micellization concentration (critical @M03889@ concentration), symbol $$c_{\text{M}}$$, abbreviation cmc (or c.m.c.). As values obtained using different properties are not quite identical, the method by which the cmc is determined should be clearly stated.