The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
inverse of conductance quantum
 $G_0^{-1}$
 Numerical value  12 906.403 72... OmegaRed
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  12 906.403 72... Omega    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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