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Older values of the constants Archive of older articles and tables of values Although this site provides the latest self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use, for historical purposes, its immediate predecessor of 1986 may be accessed below: 1986 values:      Article and tables of values in Acrobat pdf form Summary of the 1986 adjustment, including the covariance matrix of selected constants: E. R. Cohen and B. N. Taylor, Journal of Research of the National Bureau of Standards, Vol. 92, No. 2, pp. 85-95 (1987), entitled "The 1986 CODATA Recommended Values of the Fundamental Physical Constants." (This is the article available from the above link.) Full details of the 1986 adjustment: E. R. Cohen and B. N. Taylor, Reviews of Modern Physics, Vol. 59, No. 4, pp. 1121-1148 (1987), entitled "The 1986 adjustment of the fundamental physical constants," or E. R. Cohen and B. N. Taylor, CODATA Bulletin Number 63, November 1986, entitled "The 1986 Adjustment of the Fundamental Physical Constants."       Return to Background information related to the constants.