The coefficient of viscosity for hot air is

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(A) The viscosity of gases is primarily due to the transfer of momentum between layers of gas molecules moving at different velocities.According to th

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Greater than the coefficient of viscosity for cold air

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(A) The viscosity of gases is primarily due to the transfer of momentum between layers of gas molecules moving at different velocities.According to the kinetic theory of gases,the coefficient of viscosity $\eta$ is given by $\eta = \frac{1}{3} \rho v_{avg} \lambda$,where $\rho$ is the density,$v_{avg}$ is the average speed of molecules,and $\lambda$ is the mean free path.As temperature increases,the average speed of gas molecules $(v_{avg} \propto \sqrt{T})$ increases.Although the mean free path $\lambda$ may change,the increase in the average speed of molecules dominates,leading to an increase in the coefficient of viscosity with temperature.Therefore,the coefficient of viscosity for hot air is greater than that for cold air.

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