Question

v=π/8 pr4/ni determine the dimensions of n​

Answer 1

$v = \frac{\pi}{8} \frac{p {r}^{4} }{ni}$

Where p is the pressure difference between the two ends and n is coefficient of Viscosity of the liquid having dimensional formula

$ML^{-1}T^{-1}$

check whether the equation is dimensionally correct.