The transfer of energy that occurs when molecules collide is called conduction.

Here's a breakdown:

* Conduction: Heat transfer through direct contact between molecules. When molecules collide, they transfer kinetic energy to each other. The faster-moving molecules (higher temperature) lose energy and slow down, while the slower-moving molecules (lower temperature) gain energy and speed up. This process continues until the two objects reach thermal equilibrium (the same temperature).

Let me know if you'd like more details on conduction or other heat transfer mechanisms!