Argon is admitted to a viscosity cell at and

PHYSICS · Multi-part · Fermi University Physics · Thermal, Statistical & Complex Systems · Kinetic theory and transport in gases · Kinetic theory and transport in gases

Thermal Physics, Ch Collisions, mean free path and transport in gases

Problem

Argon is admitted to a viscosity cell at

p = 50\,\mathrm{kPa}

and

T = 300\,\mathrm{K}

. Treat it as an ideal gas of hard spheres of diameter

d = 0.34\,\mathrm{nm}

and molar mass

39.9\,\mathrm{g\,mol^{-1}}

. In every case below the mean free path stays far smaller than the dimensions of the cell. ((a)) Use the mean-free-path estimate of this chapter to find the viscosity of the argon at

50\,\mathrm{kPa}

and

300\,\mathrm{K}

. ((b)) More argon is added until the pressure is

150\,\mathrm{kPa}

, the temperature being held at

300\,\mathrm{K}

. What is the estimated viscosity now? ((c)) The pressure is returned to

50\,\mathrm{kPa}

and the cell is heated to

600\,\mathrm{K}

. What is the estimated viscosity?

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