# What is the formula for Linear strain or longitudinal strain?

Posted in Elasticity | Email This Post |The linear strain is the ratio of change in length to the original length.

The length is shortened in the direction of the forces when the forces are compressive. This is called the linear strain or Compressive Strain . If the change in length is ‘ l ‘ in a wire or bar of original length L,

the formula for Linear strain or longitudinal strain is given as,

**Linear Strain or Compressive Strain = Change in length / Original Length**

**Linear Strain or Compressive Strain = Δ l / L**

The change in length can be an increase or decrease.

As the linear strain is ratio of lengths,it has no unit and dimension.