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The atomic mass unit is not a SI unit.
An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
Atomic mass unit
The atomic mass unit is used to express the measure of the atomic mass.
AMU stands for atomic mass unit. 1 amu is 1.66053892 times 10 up to the negative 27 kilograms.
Atomic Mass Unit (amu)