Atomic Mass Unit (amu):

“The unit used to express the relative atomic mass is called atomic mass unit (amu). It is 1/12th of the mass of one carbon atom.”

On C–12 scale, the relative atomic mass of 6C12 is 12.0000 amu and that of 1H1 is 1.008 amu.  

1 a.m.u. = 1.661×10–27 kg

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