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"There could be, but it would be a gas. (Short answer: No)"

This is not entirely true. We deem a liquid as "incompressible" only because it's degree of compression is sufficiently small. That being said, and to be pedantic, liquids are on some level compressible.


Difference between phases near critical pointLet us imagine that we seal a pressure cooker, and boil water in it, letting pressure of steam increasing above the surface of water. Let us proceed until the pressure and temperature reaches a certain amount, the so-called ``critical point''. What happens to liquid water? What happens to steam above it? What happens to the surface that lies between the two phases of matter?

As the liquid (the water) is approaching the critical point, it expands, its density decreases and ***ITS COMPRESSIBILITY INCREASES***. As for the steam, it gets more and more dense. After the critical point, the properties of the ``liquid'' are indistinguishable from that of the steam, and the ``surface'' between them disappears.

http://www.britannica.com/EBchecked/topic/343026/liquid/51878/Behaviour-of-substances-near-critical-and-triple-points

http://en.wikipedia.org/wiki/Critical_point_(thermodynamics)#Table_of_liquid-vapor_critical_temperature_and_pressure_for_selected_substances

You can watch the process directly, thanks to experiments done with camera:

http://www.YouTube.com/watch?v=CgFrAOe4ZgI

http://www.youtube.com/watch?v=yBRdBrnIlTQ

Supercritical fluids in nature:

  • ``Black smokers'' in deep marine bottoms
  • Venus's athmosphere near the surface
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14y ago
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14y ago

compressing air is, but the energy needed to compress liquid for the use you could get, generally no. Compressing air or other gases' has a lot of uses. Compressed air can be used to drive air tools, drills, sanders, ratchet, rams or other controls. Compressing gases like propane has many uses, oxygen, nitrogen have uses in my field, gas fitting.

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Q: Is compressing air or liquid useful?
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