Which gas law explains the relationship between pressure and volume of a gas?

Boyle's Law specifically describes the inverse relationship between the pressure and volume of a gas when the temperature and the number of moles of gas are held constant. According to this law, as the volume of a gas decreases, the pressure increases, provided the temperature remains unchanged. This can be represented mathematically as ( P \propto \frac{1}{V} ), which means that pressure and volume are inversely proportional.

This relationship is fundamental in understanding how gases behave under different conditions, such as during compression and expansion. For example, if you have a balloon and you compress it by applying pressure, you will notice that the volume of the balloon decreases, illustrating Boyle's Law in action.

In contrast, Charles's Law pertains to the relationship between temperature and volume, Avogadro's Law deals with the relationship between volume and the number of moles of gas, and the Ideal Gas Law combines these relationships (including pressure, volume, temperature, and moles) into one comprehensive equation. Therefore, Boyle's Law is the correct answer when focusing solely on the relationship between pressure and volume.