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Correlation coefficient between two constants 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       proton mass  Numerical value  1.672 621 923 69 x 10-27 kg  Standard uncertainty  0.000 000 000 51 x 10-27 kg   Relative standard uncertainty  3.1 x 10-10  Concise form  1.672 621 923 69(51) x 10-27 kg       Correlation coefficient r of the above two quantities: r  =  0.51521 Click here to select a new correlation pair Source: 2018 CODATA      recommended values  Definition of uncertainty        Correlation coefficient with any other constant