1. The problem statement, all variables and given/known data Suppose that one mole of an ideal gas expands in a quasi-static adiabatic process from P1 = 1 Pa and V1 = 1m3 to V2 = 8m3. What is the change in the pressure and the entropy of the gas? 2. Relevant equations PV[tex]\gamma[/tex]=constant 3. The attempt at a solution I can't come up with a second equation that doesn't introduce another unknown. I've been working on thermodynamics for the past two days almost non-stop and I'm drained. Any help would be nice. thanks.