Does Specific Volume Change with Pressure in Incompressible Liquids?

[Ry122]

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.

 

[Mapes]

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.

 

[Ry122]

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?

 

[Mapes]

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.