Question

why atomic mass is called relative atomic mass

Answer 1

Atomic mass is also called Relative Atomic Mass as it is calculated as the no. of times an atom of an element is heavier than 1/12 th the mass of an Carbon atom ( C-12 isotope ) .

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Answer 2

A relative atomic mass (also called atomic weight; symbol: Ar) is a measure of how heavy atoms are. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom. ... Relative atomic mass is the same as atomic weight, which is the older term.