Final answer:
Boyle's law states that the pressure is inversely proportional to the volume of a gas, provided that temperature and the amount of gas remain constant.
Step-by-step explanation:
Boyle's law states that the pressure (P) is inversely proportional to the volume (V) of a gas, provided that temperature and the amount of gas remain constant. This means that as the volume of a gas increases, the pressure decreases, and vice versa.
For example, if you have a balloon filled with a gas and you squeeze it, reducing its volume, the pressure inside the balloon will increase. On the other hand, if you let the balloon expand, increasing its volume, the pressure inside the balloon will decrease.
Therefore, the correct option that matches the given definition is C. Boyle's law.