A sealed tin of air is left in hot sunshine. The tin does not change size. What happens to the pressure inside?

1. Sunshine heats the air inside the tin, giving its particles more energy. 2. Particles with more energy move faster than before. 3. Faster particles hit the walls of the tin more often and with more force. 4. More frequent and harder hits mean a higher pressure. 5. The tin does not change size, so the particles have no extra room to spread into. 6. The pressure therefore rises rather than falls or halves. 7. It cannot vanish, because the particles keep moving as long as the gas is there. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), How does heating or cooling a gas change its pressure?_