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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.
Mass is often specified in smaller units than the kilogram, by changing the power-of-10 prefix multiplier. A mass of one gram (1 g) is 10 -3 kg.A mass of one milligram (1 mg) is 10 -6 kg, or 10 -3 g. A mass of one microgram (1 Âµg) is 10 -9 kg, or 10 -6 g.t is defined as the mass of a particular international prototype made of platinum-iridium and kept at the International Bureau of Weights and Measures. It was originally defined as the mass of one liter (10 -3 cubic meter) of pure water.