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Click symbol for equation Stefan-Boltzmann constant  Value  5.670 400 x 10-8 W m-2 K-4  Standard uncertainty  0.000 040 x 10-8 W m-2 K-4   Relative standard uncertainty   7.0 x 10-6  Concise form  5.670 400(40) x 10-8 W m-2 K-4       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant     or