The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
Stefan-Boltzmann constant
 $\sigma$
 Numerical value  5.670 374 419...  x 10-8 W m-2 K-4
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  5.670 374 419... x 10-8 W m-2 K-4    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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