The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
Units &
Uncertainty
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Correlation coefficient between two constants
Avogadro constant
 $N_{\rm A}$
 Numerical value  6.022 140 76  x 1023 mol-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  6.022 140 76 x 1023 mol-1    
 
Josephson constant
 $K_{\rm J}$
 Numerical value  483 597.848 4...  x 109 Hz V-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  483 597.848 4... x 109 Hz V-1    
 
Correlation coefficient r of the above two quantities:
r  =  0.0
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Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
      Correlation coefficient with
any other constant

 
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