Question

The dimensional formula for Reynold’s number is

• A. $\left[L^{0}\,M^{0}\,T^{0}\right]$
• B. $\left[L^{1}\,M^{1}\,T^{1}\right]$
• C. $\left[L^{-1}\,M^{1}\,T^{1}\right]$
• D. $\left[L^{1}\,M^{1}\,T^{-1}\right]$

Answer 1

Answer: (A)

Reynold's number describes the ratio of inertial force per unit area to viscous force per unit areq for a flowing fluid.
Thus, Reynold's number is the ratio of two physical quantity of same dimension which cancel out each other. Hence, Reynold's number is dimensionless quantity.