The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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joule-hartree relationship
 $  1\,{\rm J} = [{\rm J}/(2\,hc\,R_\infty)] \, E_{\rm h} $
 Numerical value  2.293 712 278 3963 x 1017 Eh
 Standard uncertainty  0.000 000 000 0045 x 1017 Eh
  Relative standard uncertainty  1.9 x 10-12
 Concise form  2.293 712 278 3963(45) x 1017 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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