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Strain in a body  When a body is subjected to some deforming  force , the configuration of the body changes (i.e. length or volume or the shape of the body changes and the body is said to be strained by the force. The strain produced in a body is measured as the ratio of the change in configuration to the original configuration of the body. As the strain is the ratio of two identical quantities, hence it has no units and no dimensions . Strain in a body Types of strain Strain is of three types. a)  Tensile or longitudinal strain : If the deforming force produces a change in length alone, the strain, the strain is said to be longitudinal strain. Within elastic limit, it is defined as the ratio of the change in length (ΔL) of the body to its original length(L) Hence,  longitudinal strain = ΔL/L . b)  Bulk or volumetric strain : If the deforming force produces a change in volume alone, the strain is said to be volumetric strain. Within  elastic ...