熔盐体系中的活度通常用电动势法测定。但当构成熔盐的金属的电负性相近时,由于金属与熔盐的相互作用而使该法受到一定限制。在这种情况下,用蒸气压法或化学平衡法可以避免上述困难。作为一个例子,本文用化学平衡法研究了AgCl-CuCl熔体中的活度。 The activity in the molten salt system is usually determined by the electromotive force method. However, when the electronegativities of the metals that make up the molten salt are similar, the method is subject to certain limitations due to the interaction of the metal with the molten salt. In this case, the above difficulties can be avoided by the vapor pressure method or the chemical equilibrium method. As an example, the activity of AgCl-CuCl melt was studied by chemical equilibrium method.