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neutron mass  Numerical value  1.674 927 498 04 x 10-27 kg  Standard uncertainty  0.000 000 000 95 x 10-27 kg   Relative standard uncertainty  5.7 x 10-10  Concise form  1.674 927 498 04(95) 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