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Dear pallabhi,
The unified atomic mass unit replaced the atomic mass unit (chemical scale) and the atomic mass unit (physical scale), both having the symbol amu. The amu (physical scale) was one-sixteenth of the mass of an atom of oxygen-16. The amu (chemical scale) was one-sixteenth of the average mass of oxygen atoms as found in nature.
1 u = 1.000 317 9 amu (physical scale) = 1.000 043 amu (chemical scale)
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