The heating of a liquid within a dialyzing bag suspended over a hot plate: "The pervaporation of a liquid results in quick evaporation through the membrane; any colloids in solution remain within the bag while crystalloids (bodies that in solution can pass through a semipermeable membrane) diffuse out and crystallize on the outer surface of the bag (perstillation)."

"Colloids are two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out."