Question

Pick the correct statement about viscosity.

• A. In general, it decreases with temperature for liquids because the internal force of attraction between two fluid layers gets decreased.
• B. In general, it decreases with temperature for gases because the internal force of attraction between two fluid layers gets decreased.
• C. In general, it increases with temperature for liquids because the internal force of attraction between two fluid layers gets increased.
• D. In general, it increases with temperature for gases because the internal force of attraction between two fluid layers gets increased

Answer 1

Answer:

A. In general, it decreases with temperature for liquids because the internal force of attraction between two fluid layers gets decreased.

Viscosity is the resistance to the motion of fluid layers. In liquids, the cohesive force causes viscosity, which decreases with temperature as molecules move away from each other. In gases, viscosity is caused by molecular randomness, which increases with temperature, causing viscosity to increase. Pressure has no effect on viscosity.