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ChemInform Abstract It is demonstrated that the developed form of the high-temp. isopiestic technique is very useful for measurements of the isothermal-isobaric compositions of melts (not only liquid alloys, but also molten salts) with only one common volatile component. The activities of Hg in Hg-Bi, Hg-Ga, Hg-In, and Hg-Sn amalgams are calculated from the measured isothermal-isobaric data using Hg-Cd amalgam as reference system. Based on these data, the activities of Bi, Ga, In, and Sn in the amalgams are derived.