本文根据相律导出紧邻相区内不同的相的总数,及其相边界的维数之间的对应关系定理和它在恒压相图中的几条推论。应用这个定理及其推论,可导出相图原理中的边界法则和相区接触法则,亦可说明一、二、三、四元各类相区中紧邻相区及其边界的关系。 According to the law of phase, this paper deduces the correspondence between the total number of different phases in the immediately adjacent phase region and the dimension of its phase boundary and its several inferences in the constant pressure phase diagram. Applying this theorem and its corollary, we can derive the boundary law and the law of phase contact in the principle of phase diagrams, as well as the relations between the adjacent phase regions and their boundaries in all kinds of phase regions of one, two, three and four yuan.