The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
Topics:
Values
Energy
Equivalents
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Background

Constants
Bibliography

Constants,
Units &
Uncertainty
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Older values of the constants

    Archive of older articles and tables of values
    The 1973 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    Committee on Data for Science and Technology (CODATA) are provided for historical reference below:

      

    Return to Background information related to the constants.