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Click symbol for equation first radiation constant†  Numerical value  3.741 771 852...  x 10-16 W m2  Standard uncertainty  (exact)   Relative standard uncertainty  (exact)  Concise form  3.741 771 852... x 10-16 W m2     †The full description of unit m2 is m-2×(m/cycle)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