Give an example of a physical quantity which is dimensionless.

Strain = Change in dimension/Original Dimension = [M0 L0 T0]

What is strain?

An object or medium under stress becomes deformed. The quantity that describes this deformation is called strain.

  • Strain is defined as a force acting per unit area of a body
  • Strain is the ratio of change in dimensions of a body under a force and original dimensions.
  • Strain is a dimensionless quantity because it is a ratio of two similar quantities: lengths, area, or volume.

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