* Kinetic Molecular Theory: The kinetic molecular theory of gases states that gas molecules are constantly in random motion and collide with each other and the walls of their container. The higher the temperature, the faster these molecules move.

* Increased Collisions: As the gas molecules move faster, they collide with the walls of the container more frequently and with greater force.

* Pressure Definition: Pressure is defined as the force exerted per unit area. Since the collisions are more frequent and forceful, the pressure inside the container increases.

Think of it this way: Imagine a bunch of tiny balls bouncing around inside a box. If you heat the box, the balls will move faster and hit the walls of the box more often and with more force, creating more pressure inside the box.

Important Note: This explanation assumes the container is truly rigid and its volume remains constant. If the container could expand, some of the increased pressure would be relieved by the container expanding.