The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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elementary charge over h-bar
 $e/\hbar$
 Numerical value  1.519 267 447...  x 1015 A J-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.519 267 447... x 1015 A J-1    
 
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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