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Lesson Summary. The atomic mass unit (AMU) is used by scientists to describe the mass of atoms. If you want to convert a mass in grams to AMU, all you need to do is divide by 1.660599 x 10^-24 g/AMU. To unlock this lesson you must be a Study.com Member. Create your account.
Are used to quantify the masses of individual atoms. Atoms and isotopes of atoms all have different atomic weights measured in amu, but the average atomic mass of any given species of atiom remains the same. For example, the atomic mass of a pure Helium atom will always be defined as 4.003.