Almost all reports (articles or any other material) related to this issue mention that there is "experimentally measured" this property by measuring a given physico-chemicalproperty of the system under study, regularly, an aqueous surfactant soluction. The experimental determination of a the physicochemical property (surface tension, viscosity, density, electrical conductivity, etc.) of a mixture at a given concentration of surfactant is repeated to generate the corresponding trend, which almost always will show an abrupt change at a concentration related to that of the cmc, which is determined following the conventional method of crossing two straigth lines which represent theobserved experimental behavior. This is not always straightforward because the difficulty to adjust the experimental points to one of the two straight lines used for this. According to the above, one is able to estimate or derive or determine cmc, but this is never measured directly!!!!
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