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Click symbol for equation tau molar mass  Numerical value  1.907 54 x 10-3 kg mol-1  Standard uncertainty  0.000 13 x 10-3 kg mol-1   Relative standard uncertainty  6.8 x 10-5  Concise form  1.907 54(13) x 10-3 kg mol-1       Click here for correlation coefficient of this constant with other constants Source: 2018 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant