IUPAC definition : Non-SI unit of mass (equal to the atomic mass constant), defined as one twelfth of
the mass of a carbon-12 atom in its ground state and used to express masses of atomic
particles, u 1.660 5402 10 x 10E-27 kg.;
Non-SI unit of mass (equal to the atomic mass constant), defined as one twelfth of
the mass of a carbon-12 atom in its ground state and used to express masses of atomic
particles, u 1.660 5402 10 x 10E-27 kg.
Automatic exact mappings (from CISMeF team)