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Nov5-11, 12:30 AM
P: 757
The mean free path is small enough to make air behave like a fluid, at which point you treat it as a continuous medium and go on from there. It doesn't really make sense but somehow it works. Especially for room temp air where the speed of sound is on the order of the average molecular speeds, so yes it is confusing.

We'll see if someone can come out with a good explanation.