Presents a rigorous development of thermodynamic laws of phase equilibria beginning with fundamental principles, accompanied by a short description of the mathematics vital to a clear understanding of basic concepts as well as the practical methods used to calculate phase equilibria. Offers excellent explanations of well-established thermodynamic tools and novel, state-of-the- art techniques representing real fluid behavior. Models covered are relevant to the modeling of nonelectrolyte mixtures over wide ranges of pressure, temperature, composition and molecular diversity.