Change volume and pressure of a given amount of liquid?

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Discussion Overview

The discussion revolves around the possibility of changing the volume and pressure of a given amount of liquid, with particular emphasis on the properties of liquids under pressure and their behavior in different contexts, including medical applications like glaucoma.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Experimental/applied

Main Points Raised

  • Some participants question whether it is true that the volume and pressure of a given amount of liquid cannot be changed.
  • One participant suggests that pressure in a liquid varies with depth, indicating that pressure can change significantly in different contexts.
  • Another participant asserts that while liquids are generally incompressible, they can undergo small changes in volume under sufficient pressure.
  • It is noted that liquids are not very sensitive to pressure changes compared to gases, and their volume changes are minimal under pressure, primarily responding to temperature changes.
  • In the context of glaucoma, participants discuss intraocular pressure and explore potential methods for reducing it, indicating a medical application of the principles discussed.

Areas of Agreement / Disagreement

Participants express differing views on the compressibility of liquids and the relationship between pressure and volume, indicating that multiple competing views remain. The discussion about glaucoma introduces additional complexity without resolving the initial question about liquids.

Contextual Notes

Participants mention that the behavior of liquids under pressure may depend on specific conditions and contexts, such as depth in water or medical scenarios, which may not be fully explored in the discussion.

mather
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hello!

is it totally true that there is no way to change the volume and pressure of a given amount of liquid?

thanks!
 
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mather said:
hello!

is it totally true that there is no way to change the volume and pressure of a given amount of liquid?

thanks!

What makes you say that? Do you suppose that the pressure in a cup of water is the same at the surface of the ocean, and 1000 meters down under the surface?
 
I think we cannot compress a balloon full of water, while we can compress a balloon of gas (or probably of a solid material too?)
 
mather said:
I think we cannot compress a balloon full of water, while we can compress a balloon of gas (or probably of a solid material too?)

A change in volume is different from a change in pressure.

And liquids can undergo a small change in volume given enough pressure. Can you find a web page that discusses this? It's pretty easy using Google...
 
You can, although liquids in general are not very sensitive to pressure, that is, their volumes and other thermodynamic properties do not greatly change with pressure, only with temperature. Same for solids.

The pressure, however, changes greatly. If you apply a pressure of 500 times the atmospheric pressure, the liquid will be at that pressure, but the liquid won't have much sensibility to this pressure change as most gases do.
 
I was thinking about glaucoma

intraocular pressure is a major causative factor and I wondered if there is a way to reduce it apart from removing its excess
 
mather said:
I was thinking about glaucoma

intraocular pressure is a major causative factor and I wondered if there is a way to reduce it apart from removing its excess

Your opthomologist can advise you on your eye health. If intraocular pressure is an issue for you, s/he can prescribe eyedrops that will reduce the pressure.
 
berkeman said:
Your opthomologist can advise you on your eye health. If intraocular pressure is an issue for you, s/he can prescribe eyedrops that will reduce the pressure.

thanks, but I am not a patient looking for relief or advise, I am just wondering about new methods for treating glaucoma
 
mather said:
thanks, but I am not a patient looking for relief or advise, I am just wondering about new methods for treating glaucoma

Are you familiar with the causes of glaucoma? Mostly the problem is inadequate draining of the fluid through the angle:

http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002587/

Treatments address this drainage capability...
 

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