A
film in which mass transfer can occur between the
film and the coexisting bulk phases, for all the components. The term partly open film
applies to a
film in which mass transfer can occur only for certain components. The term closed film
applies to those films with fixed mass.
Source:
PAC, 1994, 66, 1667
(Thin films including layers: terminology in relation to their preparation and characterization
(IUPAC Recommendations 1994))
on page 1671