1. The problem statement, all variables and given/known data A closed cylinder with a piston is used to compress gas that is initially at 1bar and temperature 293K. The compression is performed adiabatically until the volume is 1m3 and the pressure is 10bar, calculate the work done. 2. Relevant equations pV = nR0T - ideal gas assumption pVy = const. - adiabatic compression W = (p2V2 - p1V1) / y - 1 - work for adiabatic compression 3. The attempt at a solution We have the following unknown variables: T2 , V1 and y. And we only have two equations. Is there anything I am missing?