Halliday, Resnick & Walker — The Kinetic Theory of Gases: Problem 80

Oxygen ($O_2$) gas at 273 K and 1.0 atm is confined to a cubical container 10 cm on a side. Calculate $\Delta U_g/K_{avg}$, where $\Delta U_g$ is the change in the gravitational potential energy of an oxygen molecule falling the height of the box and $K_{avg}$ is the molecule’s average translational kinetic energy.