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Meaning of Atomic mass unit. Information and translations of Atomic mass unit in the most comprehensive dictionary definitions … It is the carbon-12 atom, which, by international agreement, has been assigned a mass of 12 atomic mass units (u). Definition of atomic mass unit in the Definitions.net dictionary. A very, very small unit of mass used to express the mass of atoms and molecules, conceptually equal to 1 gram divided by Avogadro’s constant.Since 1961, by definition the unified atomic mass unit is equal to one-twelfth of the mass of the nucleus of a carbon-12 atom.Referring to the definition … Information and translations of atomic mass unit in the most comprehensive dictionary definitions … Meaning of atomic mass unit. Definition of Atomic mass unit in the Definitions.net dictionary. The amu is an older unit, and has been replaced by the unified atomic mass unit. unified atomic mass unit. Besides the standard kilogram, it is a second mass standard. Learn vocabulary, terms, and more with flashcards, games, and other study tools. n. Abbr. atomic mass unit meaning: 1. a unit used for measuring atomic mass, equal to one twelfth of the mass of an atom of carbon in…. atomic mass unit A unit in mass spectrometry that represents the relative scale, in which the mass of 1H is given an integral value of 1, 12C is 12, and so on. Define atomic mass unit. What does Atomic mass unit mean? What does atomic mass unit mean? History. For example, one atom of helium-4 has a mass of … The unit of measure for mass is the atomic mass unit (amu). Atomic mass unit definition: a unit of mass used to express atomic and molecular weights that is equal to one twelfth... | Meaning, pronunciation, translations and … atomic mass unit synonyms, atomic mass unit pronunciation, atomic mass unit translation, English dictionary definition of atomic mass unit. Atoms are the basic units of matter. An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. Start studying Atomic mass unit. a unit of mass, exactly one twelfth the mass of a neutral atom of the most abundant isotope of carbon, C 12: one atomic mass unit equals 1.6605 x 10-24 gram and is equivalent to 931.48 MeV in energy: symbol amu or u Definition of Atomic Mass. By definition, one atom of carbon-12 is assigned a mass of 12 atomic mass units (amu). The atomic weight scale has traditionally been a relative scale, that is without an explicit unit, with the first atomic weight basis suggested by John Dalton in 1803 as 1 H. [4] Despite the initial mass of 1 H being used as the natural unit for atomic weight, it was suggested by Wilhelm Ostwald that atomic weights would be best expressed in terms in units … Learn more. amu A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon-12, which is assigned a mass of 12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. Atomic mass units are described as a unit of measurement for atoms and molecules, just like the mass of a person may be expressed in pounds or kilograms. One atomic mass unit is equal to 1.66 x 10-24 grams.

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