Question

With rise in gas temperature, dynamic viscosity of most of the gases:

• A. Increases
• B. Decreases
• C. Does not change significantly
• D. Remains constant

Hint:

Remember: In gases, viscosity increases as temperature rises due to the increased molecular movement and collisions.

Answer 1

The Correct Option is A

Dynamic viscosity of gases generally increases with an increase in temperature. This is because at higher temperatures, the gas molecules move faster, leading to more frequent collisions, which in turn increases the internal friction (viscosity).
- Increases is correct. As the temperature rises, the kinetic energy of the gas molecules increases, leading to an increase in viscosity.
- Decreases is incorrect. This would be the case for liquids, but not for gases.
- Does not change significantly is incorrect because there is usually a noticeable increase in viscosity with rising temperature in gases.
- Remains constant is incorrect because temperature change has a direct impact on the viscosity of gases.
Thus, the dynamic viscosity of most gases increases with rising temperature.