The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hartree-kelvin relationship
 $(1\,E_{\rm h})/k = [2\,hc\, R_\infty/({\rm K} \,k)]\, {\rm K}$
 Numerical value  3.157 750 248 0407 x 105 K
 Standard uncertainty  0.000 000 000 0061 x 105 K
  Relative standard uncertainty  1.9 x 10-12
 Concise form  3.157 750 248 0407(61) x 105 K    
 
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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