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The first edition of the "Manual of Symbols and Terminology for Physicochemical Quantities and Units" (the "Green book") of which this is the direct successor, was prepared for publication on behalf of the Physical Chemistry Division of IUPAC in 1969. This book had as its objective, the clarity and precision, and wider agreement in the use of symbols, by chemists in different countries, among physicists, chemists and engineers, and by editors of scientific journals. The second and third editions of the "Green book" were revisions to take account of various developments in the Systeme International d'Units (SI), and other developments in nomenclature. This present volume is a substantially revised and extended version of the earlier editions, with a slightly simplified title. These extensions include some of the material previously published in appendices, all the newer resolutions and recommendations on units by the Conference Generale des Poids et Mesures (CGPM), and the recommendations of the International Union of Pure and Applied Physics (IUPAP) of 1978 and the International Organization for Standardization.
The table of physical quantities has been extended to include defining equations and SI units for each quantity and the style has been changed from being a book of rules towards being a manual of advice and assistance for the day-to-day use of practising scientists.