THE RELATIVE ATOMIC MASS OF ALUMINIUM IS 13u. EXPLAIN THE STATEMENT?

The calculated relative atomic mass is not the actual mass of the atom. It is a ratio of actual mass with respect to(relative to) the 1/12th of the mass of carbon-12 atom. 1/12 mass of carbon atom is 1 amu.
The relative atomic mass of aluminium is 13 means that the mass of aluminium is 13 times more than the 1/12th of the mass of carbon-12 atom.
The concept of relative mass was introduced as it was inconvenient for scientists to calculate the actual mass of an atom which is a very small value.
 
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it means the average mass of Aluminium as compared to 1/12th the mass of one carbon-12 atom is 13
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class e mon diye shunish na?

 
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