Percent elongation is the increase in length of the body per unit orignal length of that body.

Mathematically, percentage elongation can be expresses as;

\(Percentage.Elongation=frac{Increase.in.Length}{Orignal.Length}times 100\)¨

[Percentage.Elongation=frac{Δl}{l}times 100]

..

\(Percentage Elongation=frac{Final.Length-Original.Length}{Original.Length}\)