Answer and Explanation:
The collision of particles (or moleclues) would need to be required. Say there are two gasses, one with a higher temperature and one with a lower one. The kenetic energy in the moleclues can move in random directions, and start to bump into each other. If the warmer particle collides with the cooler one then the warmer particle would be transferring heat which is thermal energy. The particles colliding would be called thermal conduction.
