| Because of the definition of the unified atomic mass unit, each carbon-12 atom has an atomic mass of exactly 12 u, and so a mole of carbon-12 atoms weighs exactly 0.012 kg. |
| Hence, 0.02928 atomic mass unit, or 0.7 percent of the original mass, has disappeared. |
| At the other end, an atomic mass unit equals 1.66 yoctograms. |
| A Dalton, also known as an atomic mass unit, is roughly the mass of a single proton or neutron. |
| The atomic mass unit is equal to 1.66·10-24 g or one-twelfth of the mass of a carbon atom. |
| The term heavy charged particle refers to those energetic particles whose mass is one atomic mass unit or greater. |
