开尔文公式的推导方法新思路

New Derivation Methods of Kelvin Equation

应用解决热力学问题的重要方法——状态函数法，依据宏观实际过程设计途径，从相平衡条件及热力学基本关系式入手，推导出开尔文公式。有助于通过感性认识更好地理解开尔文公式及亚稳状态的本质。

The Kelvin equation is usually employed for the description of the relationship between saturated vapor pressure and radius of curved surface on liquid. Many derivations of Kelvin equation were shown in different textbooks. In this paper, according to the state function method which is generally used to solve a thermodynamic event, a specific macroscopic process was sup posed and the general form of Kelvin equation was derived based on the principle of phase equilib rium and the fundamental thermodynamic relations. This derivation method of Kelvin equation is helpful to understanding the nature of metastable state phenomena.