We consider a monoatomic gas in a closed box.(adsbygoogle = window.adsbygoogle || []).push({});

A textbook says :

Since the assumption is that the particles move in random directions, the average value of velocity squared along each direction must be same.

Why the assumption is that the particles move in random directions implies that the particles have a velocity that revolves around a fixed average velocity ?

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# I Why random motion of particles implies average velocity is the same in all directions?

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