Question

what is viscosity .. derrivation

Answer 1

ANSWER...

VISCOSITY is defined as the resistance to the flow of liquid which arises due to interval friction between layers of a liquid.

Answer 2

Answer:

What is Viscosity?

☢ It is the property of liquid by which an internal frictional force acting between two layers called viscosity.

☢ Experimentally it is found that viscous drag force or frictional force is directly proportional to area of layers, velocity gradient and it is also known as Newton's viscosity formula.

$\implies \sf F \propto A\Bigg(\dfrac{dv}{dz}\Bigg)\\ \\ \\ \implies \sf F= \eta\; A\dfrac{dv}{dz} \\ \\ \\ \implies \eta = \dfrac{F}{A.\dfrac{dv}{dz}}\\ \\ \\ \therefore\sf Where,\; \eta = Coefficient\;of\;viscosity\\ \\ \\ \sf If\;A=1\;m^{2},\sf then\; \dfrac{dv}{dz}=1\;m/s.\\ \\ \implies \sf \eta= F$

☢ Unit of Viscosity is Poiseulie (MKS) and Poise (CGS).

☢ 1 Poiseulie = 10 Poise.

☢ Dimension = [M¹ L⁻¹ T⁻¹].