The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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quantum of circulation
 $h/2m_{\rm e}$
 Value  3.636 947 5486 x 10-4 m2 s-1
 Standard uncertainty  0.000 000 0017 x 10-4 m2 s-1
  Relative standard uncertainty   4.5 x 10-10
 Concise form  3.636 947 5486(17) x 10-4 m2 s-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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