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proton Compton wavelength†  Numerical value  1.321 409 855 39 x 10-15 m  Standard uncertainty  0.000 000 000 40 x 10-15 m   Relative standard uncertainty  3.1 x 10-10  Concise form  1.321 409 855 39(40) x 10-15 m     †The full description of unit m is meter per cycle.   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