Viscosity Temperature Dependence
Easyphysics
Viscosity of liquids generally?
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Solution
Incorrect! Answer:
Decreases with temperature
- Liquid Mechanism: Viscosity in liquids arises primarily from cohesive forces between molecules.
- Thermal Impact: As temperature rises, the kinetic energy of molecules increases, which weakens these attractive intermolecular forces.
- Outcome: The layers of liquid can slide over each other more easily, so viscosity decreases. (e.g., honey flows more easily when warmed).
- Note for Gases: In contrast, gas viscosity increases with temperature because it arises from molecular collisions, which become more frequent with increased thermal motion.
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About This Question
- Subject
- physics
- Chapter
- properties of solids and liquids
- Topic
- viscosity temperature dependence
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Decreases with temperature
- Liquid Mechanism: Viscosity in liquids arises primarily from cohesive forces between molecules.
- Thermal Impact: As temperature rises, the kinetic energy of molecules increases, which weakens these attractive intermolecular forces.
- Outcome: The layers of liquid can slide over each other more easily, so viscosity decreases. (e.g., honey flows more easily when warmed).
- Note for Gases: In contrast, gas viscosity increases with temperature because it arises from molecular collisions, which become more frequent with increased thermal motion.
This easy difficulty physics question is from the chapter properties of solids and liquids, covering the topic of viscosity temperature dependence. It appeared in the 2025 exam.
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