The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-inverse meter relationship
 $(1 \ {\rm kg})c/h$
 Value  4.524 438 411 x 1041 m-1
 Standard uncertainty  0.000 000 056 x 1041 m-1
  Relative standard uncertainty   1.2 x 10-8
 Concise form  4.524 438 411(56) x 1041 m-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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