First slide

Viscous flow/Laminar flow

Question

The coefficient of viscosity for hot air is

Easy

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

Solution

If the temperature is increased, then the gases move in random motion, then the velocity gradient of the gases increase. Thus the viscous force and the coefficient of viscosity increase.

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