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Module 4: Liquid Characteristics - Viscosity - Answers
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#1
- Assuming the same force is applied, how does increasing the liquid viscosity (in Figure 1) affect the velocity of the upper plate?
- Answer: More viscous liquids such as honey and molasses exert greater resistance against the applied force than do less viscous liquids. Consequently, as the liquid viscosity increases, the velocity of the upper plate decreases.
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#2
- Using Table 1, what effect does temperature have on the absolute viscosity of a liquid? Explain.
- Answer: The absolute viscosity of liquids decreases
as the temperature increases. Energy added to the system in the form
of heat increases the kinetic energy of the molecules. With higher kinetic
energy, the molecules are able to overcome the intermolecular attraction
forces resulting in a less viscous liquid.
- For example, it is easier to pour honey or syrup from a bottle that has been stored at room temperature in the pantry than from one that has been stored in the refrigerator.