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Originally Posted by Corey Balint
.....We assumed it as an incompressible fluid though...
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Both ends would be open to Atmospheric Pressure.
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Don't get me wrong, but the atmosphere I live in is compressible. Air has a
bulk modulus. For that matter so does water, but most people refer to it incorrectly as a "incompressible".
Unless the "atmosphere" that the tube is opened to at both ends is stated otherwise, I would start by assuming it to be air and therefore, compressible. (I hate assuming, but in this case I see no alternative)