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Specific volume of substances

  • Thread starter 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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Answers and Replies

  • #2
Mapes
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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.
 
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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?
 
  • #4
Mapes
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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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