recall and use W = pΔV for the work done when the volume of a gas changes at constant pressure and understand the difference between the work done by the gas and the work done on the gas

explain how molecular movement causes the pressure exerted by a gas and derive and use the relationship pV = ⅓Nm < c² >, where < c² > is the mean-square speed (a simple model considering one-dimensional collisions and then extending to three dimensions using ⅓ < c² > = < cx² > is sufficient)