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渗透体系是广泛存在于化学、生物、地质等领域的一类体系,对这类体系的相平衡分析有重要意义,而且已经引入物化教学中。北大《物理化学习题解答(上)》中有这样一道题: 一水溶液中共有n种物质,其摩尔分数为X_1,X_2,……X_2,用一只允许水出入的半透膜将此溶液与纯水分开(如下图所示)。平衡时水面上的压力为P_ω,溶液上面的压力为P_(?),求此体系的自由度。
Penetration system is a kind of system widely existed in the fields of chemistry, biology, geology and so on. It has great significance to the phase equilibrium analysis of such systems and has been introduced into the teaching of materialization. Peking University “solution to the problem of physics and chemistry (on)” There is such a problem: a total of n aqueous solution of substances, the molar fraction of X_1, X_2, ... X_2, with a semi-permeable membrane to allow water out of this solution and Pure water separated (as shown below). The equilibrium pressure on the water surface is P_ω, and the pressure on the solution is P_ (?), To find the degree of freedom of the system.