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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?

Short Answer

Expert verified

With increase in temperature, the cohesive forces in liquids decreases which reduces the viscosity and in gases, the molecular collisions increase which increases the viscosity.

Step by step solution

01

Explanation for viscosity of liquid decreasing with temperature.

The viscosity of liquids is generally due to the cohesive forces acting between the molecules. When the temperature increases, there is increase in the energy of particles which reduces the cohesive forces. This helps in free movement of particles. Therefore, viscosity of liquids decreases with increase in temperature.

02

Explanation for viscosity of gases increasing with temperature.

The viscosity of gases is due to the molecular collision between the molecules. When the temperature increases the kinetic energy of the molecules also increases there by increasing the root mean square velocity. This helps in increased collisions and randomness of molecules making the flow of gases difficult. Therefore, viscosity of gases increases with increase in temperature.

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