The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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reduced Planck constant times c in MeV fm
 $ \hbar c $
 Numerical value  197.326 980 4... MeV fm
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  197.326 980 4... MeV fm    
 
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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