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Viscosity is a measure of the internal resistance of a fluid to flow. For example, motor oil is more viscous than water. The viscosity of a fluid will change with temperature. The graph below illustrates how the viscosity of oil changes with temperature.

Under which situation will the viscosity of the oil increase?

Effect of Temperature on Viscosity

Explanation

The viscosity of a liquid-its internal resistance to flow-is closely related to its temperature. As a liquid's temperature decreases, and it gets colder, the viscosity of that liquid will increase. Only alternative (1) mentions temperature as a factor.

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