Increase in kinetic energy can overcome intermolecular forces of attraction. How will the viscosity of liquid be affected by the increase in temperature?

Question

Philoid · Accepted Answer

Resistance to the flow of liquid is called viscosity.

F=η.A

Here,

is a velocity gradient, η is a viscosity coefficient, A is area

η = .

Putting, F = N, dx=m, A= m²,v=ms^-1

η= N/m². m/ms^-1

η= Nsm^-2

η is the proportionality constant , also known as coefficient of viscosity. SI unit of viscosity is Nsm^-2 = Pascal second (Pa s = 1kgm^-1s^-1)

Molecules with more kinetic energy can overcome the intermolecular forces to slip into one another in layers. So, when temperature increases, viscosity decreases