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alpha particle mass  Numerical value  6.644 657 3357 x 10-27 kg  Standard uncertainty  0.000 000 0020 x 10-27 kg   Relative standard uncertainty  3.0 x 10-10  Concise form  6.644 657 3357(20) x 10-27 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