# 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.

## 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

Where,

ϵ = Strain applied on an object

ΔL = Change in length

L = Initial Length

Note:

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

### Example

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 = ?

Solution

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