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The distinction is that a compressible fluid (commonly called gas)
undergoes a volume change proportionate to the pressure change Well, when an object passes through the air, does it not compress the air in front of it (and rarefy the air behind it)? This is how speakers work. Those are all pressure changes. Jose -- Money: what you need when you run out of brains. for Email, make the obvious change in the address. |
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