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Dimensionless Quantities - (Concept)

The quantities which do not have dimension are known as Dimensionless Quantities.

Because these quantities are the ratio of two similar quantities.

Example.

  1. Strain

  2. Refractive index

  3. Relative density

  4. Poisson's ratio  

So all these quantities are dimensionless.

Or they have a dimensional formula which is equal to $M^0 L^0 T^0$.

And all these quantities are unitless.

Exam Chapter
JEE MAIN Physics and Measurement
Understanding Physics (Volume-1)
Page No. : 82
Line : 4

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