The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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magnetic flux quantum
 $ {\it\Phi}_0 = 2\rmpi \hbar/2e$
 Numerical value  2.067 833 848...  x 10-15 Wb
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  2.067 833 848... x 10-15 Wb    
 
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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