Strain represents the degree of deformation or distortion in a material.

Being a dimensionless quantity, it remains consistent across all systems of units (SI, CGS, etc.).

It is closely related to Young's Modulus ($E = \frac{\sigma}{\epsilon}$), where $\sigma$ is stress.

Simplifies calculations in structural analysis by eliminating unit conversion complexities.

Provides a standardized metric to compare materials of different sizes under load.

Does not inherently indicate the magnitude of force causing the deformation without the material's elastic modulus.

Structural health monitoring using strain gauges.

Mechanical testing of materials (e.g., tensile testing).

While strain is dimensionless, it is often expressed in microstrain ($\mu\epsilon$) or as a percentage to represent very small values.

Option A (Pascal) is the unit of stress or pressure (N/m²).

Option B (Newton) is the unit of force.

Option C ($N/cm^2$) is another unit of pressure or stress.