The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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kelvin-atomic mass unit relationship
$(1 \ {\rm K})k/c^2$
 Value  9.251 0842 x 10-14 u
 Standard uncertainty  0.000 0053 x 10-14 u
  Relative standard uncertainty   5.7 x 10-7
 Concise form  9.251 0842(53) x 10-14 u    
 
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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