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The Dalton (or atomic mass unit) is a unit of mass defined as 1/12 weight of carbon-12 in its nuclear and electronic ground state.
1 Da = 1 u = 1/12 m(12C)
The dalton (Da) is equal to 1.660538921(73) × 10-27 kilograms (1 Da = 1.660538921(73) × 10-27 kg).
The Dalton (Da) is also equal to 1,822.88839 electron rest mass (me).
The energy equivalent of 1 dalton:
1 Da = 1 amu = 931.494061(21) × 106 eV/c2 = 931.494061(21) MeV/c2 = 0.931494061(21) GeV/c2
The dalton is used to indicate the mass on an atomic or molecular scale.
Also known under the name of: atomic mass unit (plural: atomic mass units, symbol: u or amu (old abbreviation))