The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Hartree energy in eV
 $E_{\rm h}$
 Numerical value  27.211 386 245 988 eV
 Standard uncertainty   0.000 000 000 053 eV
  Relative standard uncertainty  1.9 x 10-12
 Concise form  27.211 386 245 988(53) eV    
 
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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