“…The selectivity of the other group, concerning mixtures of gases and miscible liquids, is defined as the result of dividing the concentration of a certain component, in the permeates, by the concentrations of the other components. 25 The selectivity is highly dependent on the separation process and the composition of membrane or its pore size. Membranes can be applied in various processes, including the separation of all kinds of mixtures, such as gases and vapors, miscible liquids and dissolved solids, as well as solutes in liquids.…”