Strain Definition

In physics, if an object faces a deforming force that may modify the shape, it is the strain force. In other words, a strain is defined as a distorting force operating on an object that may alter its shape. It is the ratio of the variation in the length of an object to the initial measurement.


Table of Contents

Formula of Strain

To find out the strain in an object, you can use the formula listed below, or to determine it, instantly jump to our free and online calculator.

ϵ = ΔL / L


ϵ = Strain applied on an object

ΔL = Change in length

L = Initial Length


To know how to find out the strain, you can use our Strain Calculator.


For a more precise and clear understanding of the concept, let us solve an example below:

Suppose a rod of iron with a 6m is rendered and then expands by 5 x 10-3 m. Find out the entire strain put on the iron road.

Given data

Initial length = 6m
Change in length = 5 x 10-3 m

To Find

Total strain = ?


To find out the strain of iron, we will use the formula listed below:

ϵ = ΔL / L

Putting values in the formula:

ϵ = 5 x 10-3 / 6 = 8.3 x 10-4