atomic mass unit in English

noun
1
a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass of an atom of carbon-12. It is equal to approximately 1.66 x 10 -27 kg.
For example, carbon 12 has a mass of exactly 12 amu , but it is made up of six protons and 6 neutrons (1.0087 amu each).

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2. In chemistry, an Atomic mass unit or AMU is a physical constant equal to one-twelfth of the mass of an unbound atom of carbon-12.It is a unit of mass used to express Atomic masses and molecular masses.When the mass is expressed in AMU, it roughly reflects the sum of the number of protons and neutrons in the Atomic nucleus (electrons have so much less mass that they are …