what is difference between absolute mass and relative mass

Relative mass in the average atomic mass of all the isotopes present in percentage while absolute mass is the sum of number of protons and neutrons mass.  For example the absolute mass of carbon is 12.0 amu while 12.01 is the average atomic mass of carbon on the basis of percentage of C-12, C-13 and C-14 isotopes.

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the original or the actual matter contain by a object is called it's absolute mass when we compare different object or elements mass with a fixed standard mass then it is called relative mass of the elements

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