This volume is a compilation of vapor–liquid equilibrium data on subcritical binary single-phase or two-phase liquid–liquid systems. All the components are well-defined pure substances, which are organic or inorganic nonelectrolytes, including low-melting ionic liquids and water. The present database contains numerical data for 3316 systems. The book reproduces in tables and graphs the numerical values for only 802 binary mixtures, chosen to be representative of all the compound classes and property types. The full set of data is given on the CD–ROM accompanying the book. Most data files contain experimental data compiled from the original literature published from 1929 to mid 2006. The ELBT-program allows the fast search of data according to property type, chemical system, author(s), source and year of publication. It also includes the bibliographical database of ELDATA, EVLM’2006, giving 13471 references from 1888 through mid 2006 to experimental vapor–liquid equilibrium in mixtures and solution.