atomic mass unit

a·tom·ic mass u·nit

A a

Definitions of atomic mass unit words

noun atomic mass unit a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10–27 kg 3
noun atomic mass unit a unit of mass, exactly one twelfth the mass of a neutral atom of the most abundant isotope of carbon, C12: one atomic mass unit equals 1.6605 x 10-24 gram and is equivalent to 931.48 MeV in energy: symbol amu or u 3
noun atomic mass unit Also called dalton. a unit of mass, equal to 1/12 (0.0833) the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles. 1
noun atomic mass unit (formerly) a unit of mass, equal to 1/16 (0.0625) the mass of an oxygen atom having atomic mass 16. Abbreviation: amu, AMU. 1
noun atomic mass unit (chemistry) A unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon. 0

before 1950

One of the 5% newest English words

First recorded in 1950-55

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This term is known only to a narrow circle of people with rare knowledge. Only 3% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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