Some thermodynamic properties of SF6 on the binodal in the vicinity of the critical point

The presented paper considers a number of problems, with the first of them concerning the analysis of experimental (rho l, rho g, T)-data of SF6 at relative temperatures (1.5 center dot 10(-8) < tau < 0.3). The second task is to develop combined models (rho l (D, C, tau), rho g (D, C, tau), horizontal ellipsis ) 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 (rho l, rho g, T)-data is formed. It contains: a) experimental results obtained in the laboratory of Prof. Funke (Germany) and b) (rho l, rho g, T)-data obtained by recalculating some values in the laboratory of Prof. Garrabos (France). The models rho l (D, C, tau) and rho g (D, C, tau) 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.).