Charle's law describes gas. It shows that gases expand when heated. The more heat applied, the more the object/substance will grow in volume. Once you take away some heat, the object would get smaller/have less volume.
As you can see, the more we heat up the balloon, the bigger it gets. This is an example of Charle's law because the gases inside this balloon expand as we heat them up, making the balloon grow and have more volume.
In this experiment, the teacher heated up a burner. She then put a balloon in it to show the class what would happen. She tried turning the heat up, and turning the heat down.
Now, we will do a demonstration on Boyle's law. Boyle's law shows that the more pressure you apply to a gas, the less volume it has. Once you take away that pressure, then the gas will have more volume.