STATICS AND DYNAMICS IN BINARY-MIXTURES NEAR THE LIQUID VAPOR CRITICAL LINE

Static and dynamic properties are investigated near the liquid-vapor critical line in fluid binary mixtures. Simple expressions are given for thermodynamic derivatives and transport coefficients in terms of parameters characterizing the coexistence surface in the p-T- DELTA space, where DELTA is the chemical potential difference. It becomes possible to understand special crossover phenomena occurring when fluids are nearly azeotropic or when the concentration dependence of the critical temperature T//c(X) left bracket or the critical pressure p//c(X) right bracket is weak. The results are used to explain recent data on **3He-**4He mixtures that apparently contradict previous theories.