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electron mass  Numerical value  9.109 383 7015 x 10-31 kg  Standard uncertainty  0.000 000 0028 x 10-31 kg   Relative standard uncertainty  3.0 x 10-10  Concise form  9.109 383 7015(28) x 10-31 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