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electron mass  Value  9.109 382 15 x 10-31 kg  Standard uncertainty  0.000 000 45 x 10-31 kg   Relative standard uncertainty   5.0 x 10-8  Concise form  9.109 382 15(45) x 10-31 kg       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant