The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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reduced Planck constant
 $\hbar$
 Numerical value  1.054 571 817...  x 10-34 J s
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.054 571 817... x 10-34 J s    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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