The strain unit is dimensionless. It is the ratio between the length shift and the initial length, so it is unitless. Strain is the ratio of the change in the body’s proportions and the original dimensions. Engineering strain, a measure of physical deformation defined as a shift in length divided by the original length, is a more complex example of such a ratio. Since the length of both quantities is dimensionless, their ratio is dimensionless.
It is defined as the amount of deformation encountered by the body in the direction of force applied, separated by the body’s initial measurements, according to the strain description. A natural pressure is a tension that happens when an axial force is loaded by a member. For any prismatic segment, the meaning of the normal force is simply the force divided by the cross sectional area.