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Older values of the constants Archive of older articles and tables of values The 1998 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of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) are provided for historical reference below: 1998 values:      Table of All values Table of Adopted values Table of Non-SI units Table of Conversion factors Table of X-ray values   in Acrobat pdf form Summary of the 1998 adjustment, including the covariance matrix of selected constants: P. J. Mohr and B. N. Taylor, Journal of Physical and Chemical Reference Data, Vol. 28, No. 6, pp. 1713-1852, 1999. P. J. Mohr and B. N. Taylor, Reviews of Modern Physics, Vol. 72, No. 2, pp. 351-495, 2000.    Return to Background information related to the constants.