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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.
The AMU is defined as 1/12 the mass of a carbon atom with six neutrons, six electrons, and six protons. Because the mass of an electron is close to nothing, defining an AMU this way makes the mass of one proton equal to one AMU and the mass of one neutron equal to one AMU.