The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-kelvin relationship
 $ (1\,{\rm u})\,c^2/k = [m_{\rm u}\,c^2/({\rm K} \, k)]\, {\rm K} $
 Numerical value  1.080 954 019 16 x 1013 K
 Standard uncertainty  0.000 000 000 33 x 1013 K
  Relative standard uncertainty  3.0 x 10-10
 Concise form  1.080 954 019 16(33) x 1013 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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