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Atomic mass unit

The \(\textit{Unified Atomic Mass Unit}\) (symbol: \(\mu\)) or \(\textit{dalton}\) (symbol: Da) is a unit that is used for indicating mass on an atomic or molecular scale. It is defined as one twelfth of the rest mass of an unbound atom of carbon-12 in its nuclear and electronic ground state, and has a value of \(1.660538782(83) \times 10^{-27} kg\). One \(Da\) is approximately equal to the mass of one proton or one neutron. The CIPM have categorised it as a \(\textit{"non-SI unit whose values in SI units must be obtained experimentally"}\).

0.00000000000000000000000000166053878283

http://en.wikipedia.org/wiki/Atomic_mass_unit

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