Q. 12

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

B. No effect

C. Decrease

D. No regular pattern will be followed

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

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