Constants Topics: Values Energy Equivalents Searchable Bibliography Background Constants Bibliography Constants, Units & Uncertainty home page

alpha particle mass  Numerical value  6.644 657 3450 x 10-27 kg  Standard uncertainty  0.000 000 0021 x 10-27 kg   Relative standard uncertainty  3.1 x 10-10  Concise form  6.644 657 3450(21) x 10-27 kg       Click here for correlation coefficient of this constant with other constants Source: 2022 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant