boundary between portions of material liquid junction CHMO:0002350 A boundary between portions of materials that is "any junction between two electrolyte solutions of different composition. Across such a junction there arises a potential difference, called the liquid junction potential. In the operational pH cell the junction is between the test, or pH standard, solution and the filling solution or the bridge solution of the reference electrode." 2009-09-11T11:16:35Z batchelorc