the pressure difference which has to be established between a colloidal system and its equilibrium liquid to prevent material transfer between the two phases when they are separated by a membrane, permeable to all components of the system, except the colloidal ones, rõhuerinevus kolloidsüsteemi ja temaga tasakaalus oleva vedeliku vahel, eraldatuna teineteisest membraaniga, mis laseb läbi süsteemi kõiki komponente, v. a kolloidosakesed