Question

Explain why the viscosity of a liquid decreases with temperature—that is, how might increase temperature reduce the effects of cohesive forces in a liquid? Also explain why the viscosity of a gas increases with temperature—that is, how does increased gas temperature create more collisions between atoms and molecules?

Answer 1

A.

When temperature increases , kinetic energy of liquid molecules increases and the distance between the molecule increases. It causes a decrease in inter-molecular attraction between them, which reduces viscosity . Increase the temperature of a liquid is to reduce the cohesive forces

B. When temperature increases of gas than randomness of molecules increases.viscosity of a gas is caused by the transfer of momentum from one gas molecule to another. So, increasing the temperature of a gas will increase its momentum and so the viscosity.

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