The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Hartree energy
 $E_{\rm h}$
 Value  4.359 744 650 x 10-18 J
 Standard uncertainty  0.000 000 054 x 10-18 J
  Relative standard uncertainty   1.2 x 10-8
 Concise form  4.359 744 650(54) x 10-18 J    
 
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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