What relationship does Boyle's law describe?

Boyle's Law describes the relationship between the pressure and volume of a gas when the temperature is held constant. More specifically, it states that the pressure of a gas is inversely proportional to its volume. This means that as the volume of a gas decreases, the pressure increases, provided the temperature does not change. This relationship is mathematically expressed as ( P \times V = \text{constant} ).

For example, if you take a sealed syringe filled with gas and push the plunger in, you are decreasing the volume available to the gas. According to Boyle's Law, the pressure within the syringe will increase as a result. This inverse relationship is fundamental in understanding gas behavior in various scientific and engineering applications.

The other options do not accurately reflect Boyle's Law. The first option incorrectly portrays the relationship as direct, while the third and fourth options address other gas laws such as Charles's Law, which relates temperature and volume, rather than the pressure and volume relationship articulated by Boyle's Law.