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Is acoustic pressure a statistical term? Also, what about pressure in a liquid or a gas?

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What do you mean by "a statistical term"? –  David Z May 19 '11 at 20:43
    
by statistical term i mean a physical quatity defined as a statistical nature of some physical system. Like for example temperature. –  Rajesh D May 19 '11 at 20:46
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Yes, any notion of pressure at least normally assumes that there are many, $N\to\infty$, particles that are the sources of the pressure, so in this sense it is a statistical term. But just like with the temperature, one may assign pressure or temperature to a single particle, too, although for a single particle, we would usually say that it's an accident that it has one momentum or energy or another, so there's still some reason to say that it's a statistical term.

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