Question

Define viscosity ........​

Answer 1

Answer:

follow me ........__________?

Answer 2

$\: \: \: \: \: \: \: \: \: \textbf{ \large{ \underline{ \: \underline{Viscosity :} \: }}}$

Viscosity is the property of fluid in motion by virtue of which a force of resistance exist between the different layer of the fluid whenever there is relative motion between them .

According to Newton's love frictional force (or viscous force ) between two layers is given by :

$\boxed{ \bf{F= - \eta A. \frac{dv}{dz} }}$

Here, η is called coefficient of viscosity and dv/dz represents the viscosity gradient between different layer parallel to xy-plane

• SI unit of η is Ns/m²
• CGS unit of η is decapoise (= 10 poise)
• Dimentional formula of η is $\sf{ \small{(ML^{ - 1} {T}^{ - 1} ) }}$