Discussion 3 (ch12 and 13) 1. Consider "adiabatic free expansion" of a gas. A gas is contained in volume 1 and then allowed to rapidly expand into volume 2 a shown in the cartoon below. A B a) The pressure on the right is initially a vacuum. (P=0). What is the work that the gas does in this process. vacuum b) The container is "insulated", but also the process is rapid and therefore adiabatic. What is Q in this process. c) Because of a) and b), what is AE? Because of this what is the Kinetic Energy of the gas molecules before and after the expansion. d) What's the temperature change of the gas molecules after the expansion. e) Does the answer to d) make sense, what's the rms velocity before and after the expansion? This is a special case called adiabatic free expansion