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Old Aug 10th 2015, 10:13 AM   #1
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Compressible Fluid Air

Is there any other fluid expect Air which is compressible.

http://www.scienceinfusion.com/air-the-fluid/
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Old Aug 10th 2015, 10:29 AM   #2
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Yes, what do you think comes in those big cylinders marked

compressed XXX?

If your question had more detail it would be easier to understand and answer.
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Old Aug 10th 2015, 12:03 PM   #3
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Its a straight forward question. Is there any fluid expect gases(Air is a mixture of gases) So obviously I am talking about any liquid which can be compressed.
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Old Aug 10th 2015, 12:28 PM   #4
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Is there any fluid expect gases
This is not the same as the original question but nevermind, we can discuss further.


Firstly all fluids are compressible to some extent.
Otherwise sound waves, which are compression waves, would not travel in them.
Liquids are generally only slightly compressible, gases are more compressible, often much more so.

So a cylinder of compressed oxygen (which is in the air) is obviously compressed as are cylinders of compressed nitrous oxide or propane (which are not).

Mixtures (like air) should be treated differently than pure substances. There is noguarantee that you can deduce the compressibility of a mixture from the compressibilities of the pure components.

Water with lots of bubbles is more compressible than water without bubbles.

When you consider compression, you also need to consider expansion and many substances are quite expandible, although recompressing them can be difficult.
Many visco-elastic substances are like this, as are stretched rubber bands.
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Old Aug 10th 2015, 12:59 PM   #5
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Very Nice Explanation thanks.
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Old Aug 10th 2015, 01:03 PM   #6
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Can we observe the compression of water without bubble inside a close cylinder and piston arrangement.
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Old Aug 10th 2015, 03:03 PM   #7
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Yes if you have a strong enough cylinder.

You can also observe it by measuring the increase in water density with depth in the ocean.

The reciprocal of the compressibility is called the bulk modulus.

Here are some real world values for comparison

http://www.engineeringtoolbox.com/bu...ity-d_585.html
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