Question

What is meant by dimensionless quantity?

Answer 1

Dimensionless quantity means a quantity which is independent of (or does not have) physical or fundamental units( like mass, time, length , etc.). That is, a Dimensionless Quantity is purely a number or we can say a ratio of two similar quantities.

For Example:- Reynold’s Number, Strain, van’t Hoff factor, Refractive Index, and so on.