Does Specific Volume Change with Pressure in Incompressible Liquids?

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Discussion Overview

The discussion revolves around whether the specific volume of a substance must change when it undergoes a change in pressure, particularly focusing on incompressible liquids. Participants explore the implications of pressure changes and the behavior of incompressible fluids under different conditions.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant questions if the specific volume of incompressible liquids changes with pressure, suggesting that these substances might not exhibit a change in specific volume despite pressure variations.
  • Another participant asserts that incompressible fluids are idealizations that can undergo shear more easily than compression, implying that specific volume does change with pressure in real scenarios.
  • A further inquiry is made regarding the effects of shear stress versus temperature changes on pressure in incompressible substances, questioning the relationship between these factors.
  • Another participant expresses confusion about the relationship between shear stress and hydrostatic pressure, indicating a lack of clarity on how these concepts interact.

Areas of Agreement / Disagreement

Participants do not reach a consensus; multiple competing views remain regarding the behavior of specific volume in response to pressure changes in incompressible liquids.

Contextual Notes

Some assumptions about the definitions of incompressibility and the effects of shear versus temperature changes on pressure are not fully explored, leaving room for further clarification.

Ry122
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Homework Statement



Must the specific volume of a substance change when it undergoes a change in pressure? Is this true for all substances?

The Attempt at a Solution



obviously this is true in most cases but my question is: are incompressible liquids an exception? When a liquid is attempted to be compressed, does the pressure change? Because if this is the case, then incompressible substances can undergo a change in pressure without the specific volume changing.
 
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Ry122 said:
Must the specific volume of a substance change when it undergoes a change in pressure? Is this true for all substances?

Yes. So-called "incompressible fluids" are idealizations, materials that undergo shear much more easily than they undergo compression.
 
But when an incompressible substance undergoes a shear of 3000Kpa for example would the pressure of the substance be no different if it was to reach 3000Kpa through a rise in temperature rather than a change in shear?
 
Ry122 said:
But when an incompressible substance undergoes a shear of 3000Kpa for example would the pressure of the substance be no different if it was to reach 3000Kpa through a rise in temperature rather than a change in shear?

I'm not really following you here. Shear stress doesn't cause hydrostatic pressure.
 

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