The coefficient of viscosity for hot air is:
Correct answer: A. Greater than the coefficient of viscosity for cold air
- A. Greater than the coefficient of viscosity for cold air
- B. Smaller than the coefficient of viscosity for cold air
- C. Same as the coefficient of viscosity for cold air
- D. Increases or decreases depending on the external pressure
Explanation
For gases, viscosity increases with temperature because molecular momentum transfer rises with thermal speed; hence hot air has a larger viscosity than cold air.
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