The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-hartree relationship
 $(1 \ {\rm kg})c^2$
 Value  2.061 485 823 x 1034 Eh
 Standard uncertainty  0.000 000 025 x 1034 Eh
  Relative standard uncertainty   1.2 x 10-8
 Concise form  2.061 485 823(25) x 1034 Eh    
 
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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