Here's why:
* Thermal energy is the energy associated with the random motion of atoms and molecules. The faster the molecules move, the higher the thermal energy.
* Temperature is a measure of the average kinetic energy of the molecules in a substance. So, when temperature increases, the average kinetic energy of the molecules increases, causing them to move faster.
Think of it like this:
Imagine a room full of people. If everyone is standing still, the room has low energy. If everyone starts moving around, bumping into each other, the room has high energy. The higher the average speed of the people, the higher the energy level in the room.
Similarly, the faster molecules move, the more energy they have.
