The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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inverse meter-kilogram relationship
 $  (1\,{\rm m}^{-1})\,h/c = [{\rm m}^{-1}\,h c /({\rm kg}\,c^2)]\, {\rm kg} $
 Numerical value  2.210 219 094...  x 10-42 kg
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  2.210 219 094... x 10-42 kg    
The full description of unit m-1 is cycles or periods per meter.
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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