The plane ideally marking the boundary between two phases.
Note:
The term should not be used synonymously with
interphase.
Source:
PAC, 1986, 58, 437
(Interphases in systems of conducting phases (Recommendations 1985))
on page 439
See also:
PAC, 1972, 31, 577
(Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix
II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry)
on page 583
Orange Book, p. 251