How does the average kinetic energy of molecules change with an increase in temperature?

The average kinetic energy of molecules is directly related to temperature. According to the kinetic molecular theory, as the temperature of a substance increases, the molecules gain energy and move more vigorously. This increase in energy results in an increase in their average kinetic energy.

Temperature is a measure of the thermal energy of the system, so as it rises, the molecular motion intensifies, leading to a corresponding increase in their average kinetic energy. This relationship holds true for gases, liquids, and solids, although the way the energy manifests can differ based on the state of matter.

In essence, an increase in temperature correlates with an increase in the average speed of the molecules, which is a direct reflection of their kinetic energy. Thus, when the temperature rises, the average kinetic energy of the molecules also rises.