Unified Atomic Mass Unit

**Semantic type:** Quantitative Concept

**Definition:** The non-SI unit of mass in terms of which the masses of individual atoms and molecules are expressed. Unified atomic mass unit is defined as one twelfth of the mass of an unbound atom of the carbon-12 nuclide, the predominant isotope of carbon, at rest and in its ground state. It is equal to 1.6606x10(E-27) kg (approximately).

**Synonyms:** - 1.6605402 x 10-24 g - Atomic Mass Unit - Atomic Mass Unit - D - Da - Dalton - Dalton - amu - u - u - u - u - u - u - u'amu - unified atomic mass unit - unified atomic mass unit