液体的饱和蒸气压与内压

Saturated Vapor Pressure and Internal Pressure for Liquids

本文用统计热力学的方法,建立了液体饱和蒸气 p与内压 p_1间的关系式p=p_1/σexp(-(p_iV_m)/(nRT)),式中σ是一个依赖于液体密度或摩尔体积 V_m 的因子,它与 V_m 的关系如下lnσ=1/2ln(V_m^2/(V_m^2-AV_m+B))+A/(4B-A^2)^(1/2)tg^(-1)((2V_m-A)/(4B-A^2)^(1/2))-6.60,n、A 和 B 都是液体的特性常数.对 C_6H_6、CCl_4、cy-C_6H_(12)、C(CH_3)_4、n-C_6H_(14)和(CH_3)_2CO 等六种液体的检验结果表明,上述关系式能适用于广阔的温度范围.

By using statistical thermodynamics,a relation between saturated vapor pressurep_s and internal pressure p_1 of liquids has been derived,p_s=p_1/σ exp(-(p_iV_m)/(nRT))where σ is a factor which is dependent on density or molar volume V_m of liquids asfollows,ln σ=1/2 ln (V_m^2/(V_m^2-AV_m+B))+A/(4B-A^2)^(1/2)tg^(-1)((2V_m-A)/(4B-A^2)^(1/2))-6.60and n,A,B are characteristic constants.The results of testing for C_6H_6,CCl_4,cy-C_6H_(12),C(CH_3)_4,n-C_6H_(14),and (CH_3)_2 CO indicate that this relation is valid in widetemperature range.