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Click symbol for equation hartree-kilogram relationship  Numerical value  4.850 870 209 5432 x 10-35 kg  Standard uncertainty  0.000 000 000 0094 x 10-35 kg   Relative standard uncertainty  1.9 x 10-12  Concise form  4.850 870 209 5432(94) x 10-35 kg       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