## College Physics (4th Edition)

We can write an expression for the average kinetic energy: $\overline{KE} = \frac{3}{2}~\frac{PV}{N}$ $\overline{KE} = \frac{3}{2}~kT$ If the average kinetic energy increases while the volume remains constant, then the pressure must increase and the temperature must increase. The correct answer is: (d) Both the pressure and the temperature increase.