What is Reynold's number ? Give its significance.

Explanation

It is dimensionless number which determines the nature of the flow of fluid through a pipe. Reynold.s number is given by,
`R_c = (rho v D)/(eta)`
If, `" " R_c < 1000` - stream line
`" " R_c > 2000` - turbulent
`" " 1000 < R_c < 2000` - unsteady