This title covers a wide range of topics related to the Pressure Volume Temperature (PVT) behavior of complexhydrocarbon systems and documents the ability of Equations of State (EOS) in modeling their behavior. Themain objective of this book is to provide the practicing engineer and engineering student with tools neededto solve problems that require a description of the PVT of hydrocarbon systems from their compositions.Because of the dramatic evolution in computational capabilities, petroleum engineers can now study suchphenomena as the development of miscibility during gas injection, compositional gradient as a function ofdepth and the behavior near critical hydrocarbon systems with more sophisticated EOS models.