非理想溶液的蒸气压对Raoult定律的正、负偏差与溶液性质密切相关,它是研究溶液的基本出发点之一。近年来出版的一些教科书中,根据Duhem-Margules公式。证明A、B两组份构成的二元溶液,偏差的正负号是一致的。此一结论显然值得商榷。事实上,溶液蒸气压的偏差与溶液组成可有复杂的关系,活度系数的符号也常有不一致或者随溶液组成变号的情况。最近文献上已报导了许多实例。本文对偏差符号的各种类型以及产生偏差的原 Vapor pressure of non-ideal solutions is closely related to the positive and negative deviations of Raoult’s law, and it is one of the fundamental starting points for studying solutions. In some textbooks published in recent years, according to the Duhem-Margules formula. Prove the binary solution composed of two groups of A and B. The sign of the deviation is the same. This conclusion is obviously questionable. In fact, the deviation of the solution vapor pressure and the composition of the solution may have a complex relationship, and the symbol of the activity coefficient is often inconsistent or changes with the composition of the solution. Many examples have been reported in the literature recently. This article deals with the various types of deviation signs and the original