Τhis volume is a complete revision of Azeotropic Data I and II published as Advances in Chemistry Series No. 6 and No. 35, American Chemical Society. It includes revised data on systems in the original tables plus new data on azeotropes, nonazeotropes, and vapor-liquid equilibria collected since 1962.

No attempt has been made to evaluate the accuracy of the data. Where appreciable differences occur in the data from a single investigator, only the most recent data are recorded. Where differences in values from two different sources occur, both sets of data are recorded. To aid the reader in evaluating data on a given system, however, all references to that system are included.

In general, data have been obtained from the original literature. Where the original litereature was not available, data have been taken from Chemical Abstracts. In a few instances, data have been taken from collections of azeotropic data in handbooks, review articles, and so forth.

The tables are arranged in the same manner as the previous volumes. This is based on empirical formula as in Chemical Abstracts except that all inorganic compounds are listed first, alphabetically by empirical formula.

For a given binary system the lower order component according to empirical formula is chosen as the А-component, and under each A-com-ponent the В-components are also arranged according to empirical formula. For ternary and quarternary systems, the same arrangement is used, using the lowest order formula as А-component, the next lowest order as В-component, and so on.