# The unit of strain is _______.

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The unit of strain is _______.
1. m
2. m2
3. m-1
4. strain is dimensionless

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Correct Answer - Option 4 : strain is dimensionless

Explanation:

• The strain is defined as the ratio of change in dimension to the original dimension.
• If ‘δl’ changes in the length and ‘l’ is the original length, then strain = δl/l.

Hence the unit of Strain is mm/mm.

Therefore Strain has no unit. Hence it is a dimensionless term.

• The ratio of change in length to the original length is called the longitudinal strain.
• The ratio of change in diameter/breadth to the original diameter/breadth is called the lateral strain.
• The ratio of lateral strain to longitudinal strain is called the Poisson's ratio.
• The volumetric strain of a deformed body is defined as the ratio of the change in volume of the body to the deformation to its original volume.
• Shear strain is defined as the strain accompanying a shearing action. It is the angle in radian measure through which the body gets distorted when subjected to external shearing action.