Cohen 2008 IUPAC Green Book

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Cohen ER, Cvitas T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor HL (2008) Quantities, Units and Symbols in Physical Chemistry. IUPAC Green Book 3rd Edition, 2nd Printing, IUPAC & RSC Publishing, Cambridge.

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Cohen ER, Cvitas T, Frey JG, Holmstroem B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor HL (2008) IUPAC Green Book

Abstract: The purpose of this manual is to improve the exchange of scientific information among the readers in different disciplines and across different nations. As the volume of scientific literature expands, each discipline has a tendency to retreat into its own jargon. This book attempts to provide a readable compilation of widely used terms and symbols from many sources together with brief understandable definitions. IUPAC is the acronym for International Union of Pure and Applied Chemistry.


Bioblast editor: Gnaiger E

Communicated by Gnaiger Erich (2014-04-15) last update 2020-07-13
in: Anastrophe XX Entity X and elementary unit x of A X-mass Carol

Number and count

Number and count
  • In section 2.9 STATISTICAL THERMODYNAMICS (p. 39), the first entry is 'number of entities' N (SI unit: 1), and the second entry is 'number density of entities, number concentration C = N/V (SI unit: m-3).
  • In section 2.10 GENERAL CHEMISTRY (p. 42) again: 'number concentration, number density of entities' CB = NB/V (SI unit: m-3; Notes 2, 12, 14).
Note (2): The definition applies to entities B which should always be indicated by a subscript or in parentheses, e.g. nB or n(B).
Note (12): V is the volume of the mixture.
Note (14): The term number concentration and symbol C is preferred for mixtures.
Comment: Number of entities is not a number, but number of entities is a count. The IUPAC Green Book does not define nor use the term count, whereas the term count for a quantity is used by the SI without proper definition (Bureau International des Poids et Mesures 2019 The International System of Units (SI)). The way count is used in the SI suggestes the definition of count as the number of elementary entities. 'Number concentration' is a misleading term and should be replaced by the proper term 'count concentration'.
» Number
» Count


Energy and force

» Energy
» Force


Extension to terminology on nonequilibrium thermodynamics

  • Gnaiger E (1993) Nonequilibrium thermodynamics of energy transformations. Pure Appl Chem 65:1983-2002. - »Bioblast link«

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