Question

The unit of the coefficient of viscosity in $SI$ system is

• A. $ m/kg-s $
• B. $m-s/kg^{2}$
• C. $ kg/m-s^{2}$
• D. $ kg/m-s $

Answer 1

Answer: (D)

The coefficient of viscosity of a liquid is defined as the viscous force per unit area of contact between two layers having a unit velocity gradient between them.
$\eta=\frac{F}{A\left(\frac{\Delta V_{z}}{\Delta Z}\right)}$
The SI unit of coefficient of viscosity is $kg / m$-s.
Also, $1$ poise $=\frac{1}{10} kg\, m ^{-1} s ^{-1}$