viscosity temperature dependence

Question

Viscosity of liquids generally?

RankGuru · Accepted Answer

1. **Liquid Mechanism**: Viscosity in liquids arises primarily from cohesive forces between molecules.
2. **Thermal Impact**: As temperature rises, the kinetic energy of molecules increases, which weakens these attractive intermolecular forces.
3. **Outcome**: The layers of liquid can slide over each other more easily, so **viscosity decreases**. (e.g., honey flows more easily when warmed).
4. **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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viscosity temperature dependence

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