The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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kelvin-hartree relationship
 $ (1\,{\rm K})\,k = [{\rm K}\, k/(2\,hc\,R_\infty)]\, E_{\rm h} $
 Numerical value  3.166 811 563 4556 x 10-6 Eh
 Standard uncertainty  0.000 000 000 0061 x 10-6 Eh
  Relative standard uncertainty  1.9 x 10-12
 Concise form  3.166 811 563 4556(61) x 10-6 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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