What does Boyle's Law explain?

Boyle's Law describes the relationship between the pressure and volume of a gas at constant temperature. It states that, for a given mass of gas, the volume is inversely proportional to the pressure applied to it. This means that when the pressure on a gas decreases, the volume of the gas expands; conversely, if the pressure increases, the volume decreases. This principle allows us to understand how gases behave under varying pressure conditions, which is crucial in many applications, including aviation physiology where changes in altitude affect pressure and consequently gas volumes within the body.

The other options do not accurately capture the essence of Boyle's Law. For instance, Boyle's Law is not primarily concerned with how gases are measured at sea level, nor does it address the impact of temperature, which is instead covered by Charles's Law. Additionally, while the behavior of gases in confined spaces is related, Boyle's Law specifically focuses on the interplay of volume and pressure rather than the overall stability of gases.