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nature : Describe the actual gas in a state of equilibrium, the basic thermodynamic parameters (pressure, temperature, hematocrit) maintained between function relationship. In the field of engineering science and technology have made many of the actual gas equation, the main types can be summarized as follows : (1) three equations, in the traditional system, "van der Waals (van der Waals) equation of state" as the basis of the continuous development from equation has changed into the equation as : "Leidelixi-Kuang-Suoawei (Redlich - Kwong-Soavi) equation", "Peng-Robinson (Peng-Robinson) equation" and was widely used; (2) high-end multi-parameter equation, such equations are initially needle on a particular type of gas and the actual research, more targeted, higher accuracy, is inadequacy in the form of complex equations, the number of higher-order equation, computing is very inconvenient. Commonly used "the singer-Webber-Rubin (Benedict-Webb-Rubin) equation", "Martin-Hou (Martin-Hou) equation"; (3) Comparison of state equations, based on comparison of these equations based on the principle of states which established the equation, broad Pervasive sexual characteristics. Common "Lee-Kessler (Lee-HFCs) equation"; (4) The force of equation (virial equations), is based on statistical mechanics and established the equation, equations such clear physical meaning, but also into more convenient forms of low-order equation of the form can also form in contrast to the equation of state forms, is the study of the actual gas equation of the new channels; (5) Compressed factor equation, using the compression factor (see the compressibility factor) for an ideal gas equation of state amended the equation, such equations in the field of engineering technology is widely used, and with specific charts can be found, applications more convenient, but the drawback is the poor accuracy of the multi-component gas mixture of practical calculation is often difficult to be effective.
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