Abstract
The paper presents the results of studies performed to obtain approximate and high-accuracy equations of state of one-component substances. The preferred form of such equations was established. Two-and three-parameter equations of state that described experimental data much better than the other known equations of state with a small number of parameters were obtained. A step spherically symmetrical interaction potential that correctly reproduced the behavior of the real potential was suggested. Equations for the second virial coefficient of polar and nonpolar substances over the whole temperature range studied were obtained. High-accuracy equations of state of real gases describing the thermal and caloric properties of normal polar and nonpolar fluids (regular part) at densities up to 1.5ρc 10 within the accuracy of experimental (tabulated) data were obtained.
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