The viscosity of a liquid
- A. increases as the temperature rises
- B. is independent of temperature
- C. decreases as the temperature rises
- D. is a measure of how quickly it evaporates
Explanation
Viscosity is resistance to flow and it depends on the intermolecular forces, so heating a liquid gives the molecules more kinetic energy to overcome those forces and the liquid flows more freely. This is why engine oil thins in a hot engine and why honey pours easily when warmed. Gases behave in the opposite way, becoming more viscous when heated.