The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hertz-kelvin relationship
 $(1 \ {\rm Hz})h/k$
 Value  4.799 2447 x 10-11 K
 Standard uncertainty  0.000 0028 x 10-11 K
  Relative standard uncertainty   5.7 x 10-7
 Concise form  4.799 2447(28) x 10-11 K    
 
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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