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Old Jun 8th 2009, 02:02 AM   #1
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compressibility of liquids

What is the most compressible liquid and what is the measurement for it
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Old Jun 8th 2009, 03:37 AM   #2
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Liquids are generally treated as incompressible as the compressibility is very low

Compressibility is the fractional change in volume per unit increase in pressure.
On googling, i found that on increasing the pressure by 1 atmosphere, water is compressed by only 46.4 parts per million while ethyl alcohol is compressed by 111 ppm ( is that why people are able to drink so much?).
This was the highest value on that list. However i suspect liquid helium to be a good candidate though very low temp is required and it has additional problems like superfluidity etc.

I cant figure out how they measure such small values unless they use some holographic techniques etc.

Last edited by physicsquest; Jun 9th 2009 at 12:22 AM.
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Old Jun 8th 2009, 07:09 PM   #3
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Thanks. I only asked this because my textbook said "equation 9-15 is valid for fluids that are assumed incompressible, as in the case of most liquids" So naturally I wanted to know what liquids were not of the "in most cases" I found similar info that you did so I could not really figure why the text made it sound like a whole class of liquids exsisted out there that were compressible.
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