The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants
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Constants,
Units &
Uncertainty
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Stefan-Boltzmann constant
 $\sigma$
 Value  5.670 373 x 10-8 W m-2 K-4
 Standard uncertainty  0.000 021 x 10-8 W m-2 K-4
  Relative standard uncertainty   3.6 x 10-6
 Concise form  5.670 373(21) x 10-8 W m-2 K-4    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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