Question

The coefficient of viscosity for hot air is

• 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

Answer 1

Answer: (A)

For gases, viscosity increases with temperature. Hence, coefficient of viscosity for hot air is greater than coefficient of viscosity for cold air.