Final answer:
The pressure inside a heated closed tin increases because the gas molecules move faster and collide with the walls more frequently, resulting in higher pressure due to increased kinetic energy.
Step-by-step explanation:
When a closed tin is heated, the pressure inside it increases because molecules move faster and hit the tin walls more often. This is due to the fact that as temperature rises, the kinetic energy of the gas molecules increases, which results in more forceful collisions against the walls of the container. Consequently, according to Avogadro's law and Dalton's Law, when the volume is kept constant, an increase in the temperature of the gas will lead to a higher frequency and force of molecule-wall collisions, causing an increase in pressure. The phenomenon can also be explained by understanding that the higher temperature causes gas particles to expand and decrease in density. This expansion and dispersal of matter when energy is input interrupt the intermolecular forces, and as the gas molecules collide more frequently with the container walls, the pressure rises.