Question

Define a.m.u ?
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Answer 1

An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus.

Answer 2

An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12.

For example,amu of oxygen is 16. this means that 1 atom oxygen is 16 times the mass of 1/12th atom of the carbon 12 isotope.