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Click symbol for equation inverse meter-atomic mass unit relationship†  Numerical value  1.331 025 050 10 x 10-15 u  Standard uncertainty  0.000 000 000 40 x 10-15 u   Relative standard uncertainty  3.0 x 10-10  Concise form  1.331 025 050 10(40) x 10-15 u     †The full description of unit m-1 is cycles or periods per meter.   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