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由文献发表的pVT数据回归得到了许多液态聚合物的Tait方程参数。据此能够获得各种密度下聚合物的等容线。将这些等容线斜率的对数与密度作图，则无例外地发现这些作出的线是很好的直线, 故可建立一个聚合物的通用内压方程。它有两个特性常数，分别决定于直线的斜率和截距。它能用来准确地计算298.15K时各种液态聚合物的内压; 据此，得到了90个聚合物的新溶解度参数值。
The regression of pVT data published in the literature has obtained many Tait equation parameters for liquid polymers. It is thus possible to obtain isomers of polymers at various densities. By plotting the logarithm of the isosurface slope versus the density, it is straightforward to find that these made lines are good straight lines, so that a universal internal pressure equation for the polymer can be established. It has two characteristic constants, respectively, depending on the slope and intercept of the line. It can be used to accurately calculate the internal pressure of various liquid polymers at 298.15K; accordingly, the new solubility parameter values for 90 polymers were obtained.