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Click symbol for equation Stefan-Boltzmann constant  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       Click here for correlation coefficient of this constant with other constants Source: 2022 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant