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muon mass  Numerical value  1.883 531 627 x 10-28 kg  Standard uncertainty  0.000 000 042 x 10-28 kg   Relative standard uncertainty  2.2 x 10-8  Concise form  1.883 531 627(42) x 10-28 kg       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