1. The problem statement, all variables and given/known data A 1.00-mol sample of an ideal diatomic gas, originally at 1.00 atm and 15 celcius, expands adiabatically to 2.00 times its initial volume. What are the final pressure for the gas? (Assume no molecular vibration.) What are the final temperature for the gas? 2. Relevant equations lnP + gamma lnV = constant 3. The attempt at a solution I dont know how to use this equation and its the only one given in the adiabatic expansion section of my book. Can someone please guide me through. Thanks!