from: Concept in Thermal Physics by Blundell and Blundell Measurements of the vi

Question

from: Concept in Thermal Physics by Blundell and Blundell

Measurements of the viscosity, eta, of argon gas (^40 Ar) over a range of pressures yield the following results at two temperatures: at 500 K eta 3.5 times 10^-5 kg m^-1 s^-1; at 2000 K eta 8.0 times 10^-5 kg m^-1 s^-1. The viscosity is found to be approximately independent of pressure. Discuss the extent to which these data are consistent with simple kinetic theory, and the diameter of the argon atom (0.34 nm) deduced from the density of solid argon at low temperatures.

Explanation / Answer

1.when temperature is increased the collision of the molecules increase which decreases the ability of the molecules as a whole to engage in the co-ordinated move.So, when the gas gets hotter they get thicker. The viscosity of the gas increases as temperature Increases as is approximately proportional to the square root of temperature.also kinetic energy will increase because they started to move faster due to more energy.

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