The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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natural unit of action in eV s
 $ \hbar/({\rm eV\,s}) = [\hbar/({\rm J\,s})]/(e/{\rm C}) $
 Numerical value  6.582 119 569...  x 10-16 eV s
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  6.582 119 569... x 10-16 eV s    
 
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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