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Kinetic theory of gases - Worked out example

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In an experiment, the viscosity of the gas was found to be 2.25 x 10^-4 CGS units. The RMS velocity of the molecules is 4.5 x 10^4 cm/s. The density of the gas is 1 gm per liter. Calculate the mean free path of the molecules.

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A molecule has a finite size and moves randomly inside the container. While doing so, it collides with other molecules and the walls of the container. The path covered by a molecule between any two consecutive collisions is a straight line, and is called the ...

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Quasistatic isothermal expansion and free expansion

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Why isn't this valid for the free expansion process?

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