Which law states that pressure and volume are inversely proportional when temperature is held constant?

The principle that pressure and volume are inversely proportional when temperature is held constant is encapsulated in Boyle's Law. This law clearly states that for a given mass of gas at a constant temperature, the product of pressure (P) and volume (V) remains constant, which can be expressed mathematically as P1V1 = P2V2. This means that when the volume of a gas decreases, its pressure increases, provided the temperature remains unchanged.

In contrast, Charles' Law addresses the relationship between volume and temperature, indicating that volume is directly proportional to temperature when pressure is constant. Gay-Lussac's Law deals with the relationship between pressure and temperature while keeping volume constant. Avogadro's Law relates to the volume of gas at constant temperature and pressure being proportional to the number of moles of gas. Each of these laws describes different relationships, but Boyle's Law specifically focuses on the inverse relationship between pressure and volume under constant temperature conditions.