1. The problem statement, all variables and given/known data Must the specific volume of a substance change when it undergoes a change in pressure? Is this true for all substances? 3. 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.