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Boyle's Law describes the inverse relationship between the pressure and volume of a gas when temperature is held constant. According to this law, if the volume of a gas decreases, the pressure increases provided the temperature remains unchanged. This principle is foundational in understanding how gases behave under different conditions and is frequently applied in various scientific and practical contexts, such as in respiratory physiology.

The other laws mentioned pertain to different aspects of gas behavior. Charles' Law describes the direct relationship between volume and temperature at constant pressure. Avogadro's Law relates the volume of a gas to the quantity of gas in moles at constant temperature and pressure, while Graham's Law deals with the rate of diffusion of gases as a function of their molecular weights. Understanding these distinctions highlights why Boyle's Law is the most relevant for discussing the effects of volume on pressure changes.