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www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/average-atomic-mass

The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the ...

www.thoughtco.com/definition-of-atomic-mass-unit-amu-604366

Jun 30, 2019 ... 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 ...

www.convertworld.com/en/mass/atomic-mass-unit.html

The unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic and molecular masses. It is defined to be 1/12 of the mass of one  ...

www.chem.ucla.edu/harding/IGOC/A/amu.html

Atomic mass unit (amu; dalton): A unit of mass equal to exactly 1/12 the mass of oneC atom, or 1.660538921 x 10−27 kg. This is the approximate mass of one ...

www.theochem.ru.nl/~pwormer/Knowino/knowino.org/wiki/Unified_atomic_mass_unit.html

Dec 23, 2010 ... The unified atomic mass unit (u), or dalton (Da), is a unit of atomic and molecular mass. By definition it is one twelfth of the mass of an unbound ...

www.accessscience.com/content/atomic-mass-unit/060400

A unit of mass equal to exactly 1/12 of the mass of an atom of carbon-12 (12C), the predominant isot…

sites.science.oregonstate.edu/chemistry/courses/ch121-3s/ch121/Answers%20to%20interesting%20questions/history_of_the_atomic_mass_unit.htm

History of the atomic mass unit. Stanislao Cannizzaro (1826–1910), the pioneer in this field, adopted the hydrogen atom as a standard of mass and set its atomic  ...

www.merriam-webster.com/dictionary/atomic%20mass%20unit

Atomic mass unit definition is - a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most ...

saylordotorg.github.io/text_the-basics-of-general-organic-and-biological-chemistry/s05-05-atomic-masses.html

Masses of other atoms are expressed with respect to the atomic mass unit. For example, the mass of an atom of 1H is 1.008 u, the mass of an atom of 16O is ...

en.wikipedia.org/wiki/Dalton_(unit)

The dalton or unified atomic mass unit (symbols: Da or u) is a unit of mass widely used in physics and chemistry. It is ...