The books also describes a novel type of critical transition which appears to be a common feature of the equilibria of ternary mixtures. The problems associated with predicting ternary equilibria are discussed, and some novel aspects of ternary critical phenomena are illustrated. Particular attention is paid to the critical state of ternary mixtures which has hitherto been largely neglected. It is in this context that calculated phase diagrams have an important role in leading the discovery of new phenomena and guiding experimental work.The criteria for phase equilibria of multicomponent fluids with particular emphasis on the critical state are examined in this book, and models for predicting fluid equilibria (e.g., different equations of state) are compared. The properties of ternary mixtures are also likely to be more difficult to characterize experimentally. The phase behaviour of ternary and other multicomponent fluid mixtures has many novel aspects which are not manifested in binary mixtures. Experimental ternary mixture critical data are very rare and theoretical studies have been limited to data correlation rather than genuine prediction. In contrast, the investigation of ternary and other multicomponent fluids is in its infancy. There is ample experimental data for a wide variety of binary mixtures and extensive methods for prediction have been developed. The high pressure phase behaviour of binary fluid mixtures has been extensively studied during the last three decades.
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