The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of electric field gradient
 $E_{\rm h}/ea_0^2$
 Value  9.717 362 356 x 1021 V m-2
 Standard uncertainty  0.000 000 060 x 1021 V m-2
  Relative standard uncertainty   6.2 x 10-9
 Concise form  9.717 362 356(60) x 1021 V m-2    
 
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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