Question

The cause of viscosity in liquid and gases respectively are

Answer 1

Viscosity increases with temperature for a gas. More collisions per unit time mean more momentum transport to viscous losses per unit time.

Viscosity decreases with temperature for a liquid. The intermolecular forces weaken with temperature so the viscosity goes down. This effect exceeds the collision argument for gases even though both are fluids.

Answer 2

Answer:

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