一个新的恒压热容经验公式  

A New Empirical Formula for Heat Capacity at Constant pressure

作　　者：李鸿仪[1] 

机构地区：[1]上海第二工业大学化工系

出　　处：《上海第二工业大学学报》1993年第2期52-58,共7页Journal of Shanghai Polytechnic University

摘　　要：本文采用变量代换的方法,将非线性的恒压热容C_p、绝对温度T关系线性化,并据此提出了下述经验公式:InC_p=T/(AlnT+BT)式中A、B分别为线性方程的截距和斜率,其值既可由线性拟合而得,也可由分子内部化学键数目及某一温度下的C_p实验值求得.对大部分气态物质,该方程和通常三参数方程的计算精度相近,相关系数达0.9999.可用外推法.This paper linearizes the variation of heat capacity Cpat constant pressure with temperature T by means of transformation and presents following empiricol formula: InCp=T/(AlnT + BT) Where A and B are intercept and slope of linear equation respectively. Their valuas can not only be obtained by linear regression, but also from the number of bonds of the moleculeand an expert mental value of Cp at certain temperature For most gases, the precision of this correlation is close to that of three-parameter equation. Because COR > .9999, the equation can be used as extrapolation.

关 键 词：恒压热容 经验公式 绝对温度 

分 类 号：O641[理学—物理化学]