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Boltzmann constant  Value  1.380 6488 x 10-23 J K-1  Standard uncertainty  0.000 0013 x 10-23 J K-1   Relative standard uncertainty   9.1 x 10-7  Concise form  1.380 6488(13) x 10-23 J K-1       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