what is a difference between relative and absolute mass or charge??????????

Absolute mass and charge is an exact and experimentally determined quantity.
Example:The absolute mass of a proton is 1.6 x 10-27 Kg.
The absolute charge of a proton is 1.6 x 10-19 Coulomb.
Relative mass and charge is a comparitative quantity which is calculated by referring a known quantity.
Example: the relative mass of a proton is 1u.
The relative charge of a proton is +1
 

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