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Click symbol for equation unified atomic mass unit  Numerical value  1.660 539 066 60 x 10-27 kg  Standard uncertainty  0.000 000 000 50 x 10-27 kg   Relative standard uncertainty  3.0 x 10-10  Concise form  1.660 539 066 60(50) 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