The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of electric field
 $E_{\rm h}/ea_0$
 Numerical value  5.142 206 747 63 x 1011 V m-1
 Standard uncertainty  0.000 000 000 78 x 1011 V m-1
  Relative standard uncertainty  1.5 x 10-10
 Concise form  5.142 206 747 63(78) x 1011 V m-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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