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Changes in the SI from Its Introduction (1960) to the Explicit-Constant Revision (2019)

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A Brief History of the Metric System

Part of the book series: SpringerBriefs in Molecular Science ((BRIESFHISTCHEM))

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Abstract

After the introduction of the SI in 1960, some of the base units were redefined in terms of more stable standards or more precise measurement techniques. The biggest change in the system in its early years, though, was the addition of a seventh base unit, the mole, by the 14th CGPM (Conférence générale des poids et mesures, or General Conference of Weights and Measures) in 1971. A thorough revision of the SI was approved by the 26th CGPM in 2018, taking effect in 2019. The revision expressed all of the SI base units by fixing the values of such fundamental constants of nature as the speed of light and the Planck constant, resulting in today’s explicit-constant SI.

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Notes

  1. 1.

    Perrin’s phrase was constante d’Avogadro, but I will report his (dimensionless) estimates as Avogadro’s number, making the distinction between the terms that arose after his time.

  2. 2.

    Page numbers in this paragraph refer to the English translation [22].

  3. 3.

    A steradian is a measure of solid angle.

  4. 4.

    “Avogadro’s number” is used more frequently than “Avogadro number”—or “Avogadro constant” or “Avogadro’s constant” for that matter.

References

  1. BIPM (2019) Le Système international d’unités (SI). In: The international system of units (SI), 9th edn, BIPM, Sèvres, France. https://www.bipm.org/documents/20126/41483022/SI-Brochure-9.pdf. Accessed 7 Nov 2022

  2. Brown AC (1878) Molecule. In: Encyclopaedia Britannica, 9th edn, vol 16. Charles Scribner’s Sons, New York, p 621

    Google Scholar 

  3. Ostwald W (1893) Hand- und Hilfsbuch zur Ausführung physiko-chemischer Messungen, p 119

    Google Scholar 

  4. Helm GF (1894) Grundzüge der mathematischen Chemie: energetik der chemischen Erscheinungen. W. Engelmann, Leipzig, p 4

    Google Scholar 

  5. Dalton J (1808) A new system of chemical philosophy, part I. Bickerstaff, Manchester, UK, p 219

    Google Scholar 

  6. Rocke AJ (1984) Chemical atomism in the nineteenth century from Dalton to Cannizzaro. Ohio State University Press, Columbus

    Google Scholar 

  7. Commission on Isotopic Abundances and Atomic Weights (2022) The commission. https://ciaaw.org/commission.htm. Accessed 7 Nov 2022

  8. Clarke FW (1903) Report of the international committee on atomic weights. J Am Chem Soc 25:1–5

    Article  Google Scholar 

  9. Cameron AE, Wickers E (1961) Report of the international commission on atomic weights. J Am Chem Soc 84(22):4175–4197

    Article  Google Scholar 

  10. Mills I, Cvitaš T, Homann K, Kallay N, Kuchitsu K (1993) Quantities, units and symbols in physical chemistry, 2nd edn. Blackwell, London, p 46

    Google Scholar 

  11. Giunta CJ (2015) The mole and amount of substance in chemistry and education: beyond official definitions. J Chem Educ 92:1593–1597

    Article  Google Scholar 

  12. Marquardt R, Meija J, Mester Z, Towns M, Weir R, Davis R, Stohner J (2017) A critical review of the proposed definitions of fundamental chemical quantities and their impact on chemical communities (IUPAC technical report). Pure Appl Chem 89(7):951–981

    Article  Google Scholar 

  13. Giunta CJ (2016) What’s in a name? Amount of substance, chemical amount, and stoichiometric amount. J Chem Educ 93:583–586

    Article  Google Scholar 

  14. Becker P (2001) History and progress in the accurate determination of the Avogadro constant. Rep Prog Phys 64:1945–2008

    Article  ADS  Google Scholar 

  15. Perrin J (1909) Mouvement brownien et réalité moléculaire. Ann chim phys 18:1–114

    Google Scholar 

  16. Perrin J, Soddy F (trans) (1910) Brownian movement and molecular reality. Taylor and Francis, London

    Google Scholar 

  17. Hawthorne RM Jr (1970) Avogadro’s number: early values by Loschmidt and others. J Chem Educ 47(11):751–755

    Article  Google Scholar 

  18. Planck M (1901) Ueber die Elementarquanta der Materie und der Elektricität. Ann Phys 4:564–566

    Article  MATH  Google Scholar 

  19. Planck M (2000) On the elementary quanta of matter and electricity. In: Duck I, Sudarshan ECG, 100 years of Planck’s quantum. World Scientific, Singapore, pp 40–42

    Google Scholar 

  20. Einstein A, Fürth R (ed), Cowper AD (trans) (1956) Investigations on the theory of the Brownian movement. Dover, New York, pp 36–62

    Google Scholar 

  21. Perrin J (1913) Les atomes. Félix Alcan, Paris

    MATH  Google Scholar 

  22. Perrin J, Hammick DL (trans) (1916) Atoms. Van Nostrand, New York

    Google Scholar 

  23. Millikan RA (1913) On the elementary electrical charge and the Avogadro constant. Phys Rev 2:109–143

    Article  ADS  Google Scholar 

  24. Virgo SE (1933) Loschmidt’s number. Sci Progr 27:634–649

    Google Scholar 

  25. Compton AH, Doan RL (1925) X-ray spectra from a ruled reflection grating. Proc Nat Acad Sci USA 11:598–601

    Article  ADS  Google Scholar 

  26. Cohen ER, Crowe KM, Dumond JWM (1957) History of the atomic constants. The fundamental constants of physics. Interscience, New York, pp 103–182

    Google Scholar 

  27. BIPM (2022) Résolutions de la Conférence générale des poids et mesures (27e réunion) 15–18 Novembre 2022. https://www.bipm.org/documents/20126/64811223/Resolutions-2022.pdf/281f3160-fc56-3e63-dbf7-77b76500990f. Accessed 3 Jan 2023

  28. Klein HA (1974) The science of measurement: a historical survey. Dover, New York, pp 324–325

    Google Scholar 

  29. Quinn TJ (2012) From artefacts to atoms: the BIPM and the search for ultimate measurement standards. Oxford University Press, Oxford

    MATH  Google Scholar 

  30. Mills IM, Mohr PJ, Quinn TJ, Taylor BN, Williams ER (2005) Redefinition of the kilogram: a decision whose time has come. Metrologia 42:71–80

    Article  ADS  Google Scholar 

  31. Cohen ER, Taylor BN (1973) The 1973 least-squares adjustment of the fundamental constants. J Phys Chem Ref Data 2:663–734

    Article  ADS  Google Scholar 

  32. Robinson AL (1974) Metrology: a more accurate value for Avogadro’s number. Science 185:1037–1038, 1072

    Article  Google Scholar 

  33. Consultative Committee for Units (2017) Report of the 23rd meeting (5−6 September 2017) to the International Committee for Weights and Measures BIPM, Sèvres, France. https://www.bipm.org/documents/20126/31581049/23rd+meeting/36d2f52a-35ad-7efa-1354-681689a13b28. Accessed 8 Nov 2022

  34. Marquardt R, Meija J, Mester Z, Towns M, Weir R, Davis R, Stohner J (2018) Definition of the mole (IUPAC Recommendation 2017). Pure Appl Chem 90(1):175–180

    Article  Google Scholar 

  35. Giunta CJ (2019) What chemistry teachers should know about the revised International System of Units (Système international). J Chem Educ 96:613–617

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Chemistry, Le Moyne College, Syracuse, NY, USA

    Carmen J. Giunta

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Correspondence to Carmen J. Giunta .

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Giunta, C.J. (2023). Changes in the SI from Its Introduction (1960) to the Explicit-Constant Revision (2019). In: A Brief History of the Metric System. SpringerBriefs in Molecular Science(). Springer, Cham. https://doi.org/10.1007/978-3-031-28436-6_5

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