The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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atomic unit of current
 $eE_{\rm h}/\hbar$
 Value  6.623 618 183 x 10-3 A
 Standard uncertainty  0.000 000 041 x 10-3 A
  Relative standard uncertainty   6.1 x 10-9
 Concise form  6.623 618 183(41) x 10-3 A    
 
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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