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neutron mass energy equivalent  Value  1.505 349 739 x 10-10 J  Standard uncertainty  0.000 000 019 x 10-10 J   Relative standard uncertainty   1.2 x 10-8  Concise form  1.505 349 739(19) x 10-10 J       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