On this picture we can see what Charles law states.
When temperature is increased, volume increases.
When temperature is increased, volume increases.
Hot air balloons work with Charles law. When the balloon is heated, hot air particles are denser than colder particles, so the balloon rises.
In this image we can see how volume increases when temperature increases.
You can use Charles law on crushed ping pong balls too. When you put the crushed ping pong ball in hot water, the air molecules inside expand making the ping pong round again.
Charles law can also be used in architecture. For example, when someone is building a house, they will need to put tubes to get water. So they will need to consider Charles law, because if the tubes carry really hot water in the winter, and then really cold water passes through them, the tubes can contract and maybe break. The video below is an example.