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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.
It has many definitions, but the most known of them is equal to 454 metric grams. Gram (abbr. g) is a widely-spread unit of mass from the International System of Units. One kilogram, which is the basin unit of the ISU, has 1000 grams. The International System of Units (abbr. ISU, SI) is a modern system of measurement units, which is most widely used in the world. In consists of seven basic units: meters, kilograms, ampere, second, kelvin, mole, and candela).