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alpha particle mass  Value  6.644 657 230 x 10-27 kg  Standard uncertainty  0.000 000 082 x 10-27 kg   Relative standard uncertainty   1.2 x 10-8  Concise form  6.644 657 230(82) x 10-27 kg       Click here for correlation coefficient of this constant with other constants Source: 2014 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant