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proton mass  Value  1.672 621 637 x 10-27 kg  Standard uncertainty  0.000 000 083 x 10-27 kg   Relative standard uncertainty   5.0 x 10-8  Concise form  1.672 621 637(83) x 10-27 kg       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant