The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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quantum of circulation times 2
 $2\rmpi \hbar /m_{\rm e}$
 Numerical value  7.273 895 1032 x 10-4 m2 s-1
 Standard uncertainty  0.000 000 0022 x 10-4 m2 s-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  7.273 895 1032(22) x 10-4 m2 s-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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