# What is formula of Reynold's Number ??

Reynold's Number is defined as the Ratio of inertial force per unit area to the viscous force per unit Area for a flowing fluid.

It is denoted by  Re which is given by

$R_e=\frac{\rho V.d}{\eta }$

where $\rho = density \ of \ fluid$

$\eta = coefficient \ of \ viscocity$

V=velocity of fluid

d= diameter of the pipe

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