一、前言目前,国内外已把统计热力学基础作为物理化学教材中的一个组成部份.但在物理化学实验中却没有相应的实验与之配合。因此,课堂教学效果受到影响。鉴于此,陆续有人设计这方面的实验。本文用分光光度法,测量一定温度下晶体碘与其蒸气平衡时的蒸气压,然后用作图法求出晶体碘的特性温度θ,再通过 I. Introduction At present, the basic statistics of thermodynamics has been taken as an integral part of physics and chemistry teaching materials at home and abroad, but there is no corresponding experiment in physical chemistry experiment. Therefore, the effectiveness of classroom teaching is affected. In view of this, one after another to design experiments in this area. This article uses spectrophotometry to measure the vapor pressure of crystalline iodine at equilibrium with its vapor at a certain temperature and then used as a plot method to determine the characteristic temperature θ of crystalline iodine,