The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron volt-hartree relationship
 $ 1\,{\rm eV} = [(e/{\rm C})\, {\rm J}/(2\,hc\, R_\infty)]\, E_{\rm h} $
 Numerical value  3.674 932 217 5655 x 10-2 Eh
 Standard uncertainty  0.000 000 000 0071 x 10-2 Eh
  Relative standard uncertainty  1.9 x 10-12
 Concise form  3.674 932 217 5655(71) x 10-2 Eh    
 
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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