The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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kilogram-inverse meter relationship
 $(1 \ {\rm kg})c/h$
 Numerical value  4.524 438 335...  x 1041 m-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  4.524 438 335... x 1041 m-1    
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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