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应用张克武气体氩模型理论微分方程,导出液体粘度理论方程和“正烷烃沸点下的粘度值相同”的定理.本法以40种不同构型258种无机、有机、强缔合性的醇、酸、二醇及非极性纯质1528个实验数据检验,平均误差1.85％.其精度比著名的VAN VELXEN ET AL.法高9倍以上达到实验允许误差范围内.解决了近百年来无法精确计算的液体粘度这个技术科学上的关键难题.有重大理论意义和重要应用价值.“,”Zhangkewu' s theoretical equation for gas viscosity (ZTEGV) derived from the differential equation for a model of argon gas is here extended to the liquid. A theoretical equation of u2 is derived. One theorems and 2 roles was obtained by logical reasoning.The equation can be applied to both polar (e.g.diols,etc) and nonpolar liquids,the average error is 1.85% from 1528 experimental data from 258 compounds of 40 structural types.Its sccumcy is over 9 times high than that of the famous Van Velzen et al. method. It is far better than all other methods published. This paper solves one of the tremendous research tasks in cress-science of chemical engineering and condensed matter physics.