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'Atomic Mass Unit (amu)' used to express mass of atoms is replaced by 'Unified Mass (u)' ,but still the term 'amu' is used instead of 'u'.Why?
dear Jay Patel
the unified atomic mass unit was adopted by the IUPAC in 1961. Hence, before 1961 chemists used the symbol amu for their respective atomic mass units. One still sometimes finds this usage in the scientific literature today. However, the accepted standard is now the unified atomic mass unit (symbol u), with: 1 u = 1.000 043 amu . Since 1961, by definition the unified atomic mass unit is equal to one-twelfth of the mass of a carbon-12 atom.
since 1u is almost equal to the 1amu, one still sometime use this convention, and as you know its take time to change the old tradition.
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Deepak kumar singh
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