All MCAT Physical Resources
Example Questions
Example Question #1 :流
Which of the following would tend to decrease the viscosity of a liquid flowing through a pipe?
Possible Answers:
Increasing the length of the pipe
Increasing the pressure
Decreasing the volumetric flow rate of the liquid
Increasing the temperature
Decreasing the diameter of the pipe
Correct answer:
Increasing the temperature
Explanation:
The factors that influence viscosity are:
1. The molecular structure of the given liquid (i.e. what liquid is flowing)
2. Temperature
3. Extreme pressure
Liquids become less viscous with increased temperature. As temperature increases, the molecules move faster relative to one another and spend less time in contact with each other. This behavior causes the intermolecular forces to decrease, so the viscosity decreases.
Nicholas
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