The presented paper considers a number of problems, with the first of them concerning the analysis of experimental (ρ_l, ρ_g, T)-data of SF₆ at relative temperatures (1.5·10⁻⁸ < τ < 0.3). The second task is to develop combined models (ρ_l (D, C, τ), ρ_g (D, C, τ), …) that agree with a number of boundary conditions, including the requirements of the scale theory of critical phenomena. The third task deals with the calculation of (D, C)-parameters included in the combined models; at this stage, a basic array of (ρ_l, ρ_g, T)-data is formed. It contains: a) experimental results obtained in the laboratory of Prof. Funke (Germany) and b) (ρ_l, ρ_g, T)-data obtained by recalculating some values in the laboratory of Prof. Garrabos (France). The models ρ_l (D, C, τ) and ρ_g (D, C, τ) serve as the basis for computing some thermodynamic functions of SF₆ in the critical region; among them there are complexes, which consist of several properties (the average diameter of a binodal, the order parameter etc.).

本文考虑了许多问题，其中第一个问题涉及相对温度 (1.5·10 ^-8 < τ < 0.3) 下SF _{6的实验 (} ρ _l , ρ _g , T ) 数据分析。第二个任务是开发符合许多边界条件的组合模型 ( ρ _l ( D , C , τ ), ρ _g ( D , C , τ ), …)，包括临界现象尺度理论的要求。第三个任务涉及组合模型中包含的( D , C ) 参数的计算；在此阶段，形成了( ρ _l , ρ _g , T )-数据的基本数组。它包含：a）在Funke教授（德国）实验室获得的实验结果和b）（ρl _，ρg _，T）-在Garrabos教授（法国）实验室重新计算一些值获得的数据。模型ρ _l ( D , C , τ ) 和ρ _g ( D , C , τ ) 是计算SF ₆在临界区的一些热力学函数的基础；其中有复合体，由多个属性组成（双节的平均直径、阶次参数等）。