First published in 1969 to ensure clarity and consistency in scientific terminology, the Green Book has become a standard reference for chemists and related disciplines.

IUPAC has made available the abridged 4th edition of Quantities, Units and Symbols in Physical Chemistry (IUPAC Green Book) as a free PDF. This 120-page guide, updated to the latest SI standards, offers clear definitions, essential constants, and standardized symbols for chemists, teachers, and publishers worldwide.

• Free PDF (3MB)
• Free 4-page Concise Summary
• IUPAC, Quantities, Units and Symbols in Physical Chemistry, 4th edition, Royal Society of Chemistry (RSC), UK, 2023 (120 pages) ISBN: 978-1-83916-150-6