Definition: A mass equal to 1.66053906660(50) x 10-27 kg
Source: SI Brochure 9th Edition, page 145
Scaling Factor: 1.6605390666E-27 kg
Valid: 2019-05-20 -
Note: The dalton (Da) and the unified atomic mass unit (u) are alternative names (and symbols) for the same unit, equal to 1/12 of the mass of a free carbon 12 atom, at rest and in its ground state. This value of the dalton is the value recommended in the CODATA 2018 adjustment.