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proton mass energy equivalent  Numerical value  1.503 277 615 98 x 10-10 J  Standard uncertainty  0.000 000 000 46 x 10-10 J   Relative standard uncertainty  3.1 x 10-10  Concise form  1.503 277 615 98(46) x 10-10 J       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