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The Constancy of the Velocity of Light and Prospects for a Unified Standardization of Time, Frequency and Length

Abstract

The use of fundamental constants of nature for the definition of the units of physical measurements was suggested by M. Planck in 1906 (1). By assigning the value of unity to the four constants, c, h, k, and G the “natural units” of time, length, mass, and temperature can be defined. Albeit its great theoretical merit, that proposal could not be practical in 1906 since the large uncertainties in the known values of the constants would have propagated into the determination of the units.

Keywords

Light Propagation Optical Frequency Frequency Standard Fundamental Constant Unify Standardization 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Company Ltd 1972

Authors and Affiliations

  • Z. Bay
    • 1
  1. 1.National Bureau of StandardsUSA

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