Question

Define viscosity. What are its units and dimensions?

Answer 1

The viscous force acting between thetwo layers of fluid having relative velocity is given by, Coefficient ofviscosity of liquid is numerically equal to viscous force per unit area, which maintains a unit velocity gradient between two parallel layers. ...Dimensional formula of viscosity is [M1L–1T–1].

Answer 2

$\textbf {Viscosity -}$
$<i>$
A phenomenon due to that every layer of liquid opposes the motion of its adjacent layer.

Due to viscosity, there is a relative motion or velocity between two adjacent layers.

$\textbf{Unit -}$

decapoise or poiseuille

$\textbf{Dimension -}$

[ M L^-1 T^1 ]