atomic mass unit

Noun

Meaning

unit of mass for expressing masses of atoms or molecules

Source: WordNet

Synonyms

dalton atomic weight relative atomic mass mass number elemental mass isotopic mass elemental number elemental weight average atomic mass standard atomic weight relative number standard mass standard number elemental atomic weight relative weight

Show all synonyms

Hypernyms

mass unit

Examples

A given atom has an atomic mass approximately equal (within 1%) to its mass number times the atomic mass unit (for example the mass of a nitrogen-14 is roughly 14 u). Source: Internet

Since the atomic mass unit (amu) is defined as 1/12 of the mass of the 12 C atom, it follows that the molar mass of a substance, measured in grams per mole, is numerically equal to its mean atomic or molecular mass measured in amu. Source: Internet

The actual mass of an atom at rest is often expressed using the unified atomic mass unit (u), also called dalton (Da). Source: Internet

The unified atomic mass unit u was defined as: : Terminology The unified atomic mass unit and the dalton are different names for the same unit of measure. Source: Internet

This is also why the mass of a proton or neutron by itself is more than (and not equal to) 1 u. The atomic mass unit is not the unit of mass in the atomic units system, which is rather the electron rest mass (m e ). Source: Internet

Close letter words and terms

atomic mass 288 atomic mass 79.904 u atomic mass number atomic matter atomic measurement atomic mechanism