Boyle’s Law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, provided the temperature remains unchanged within a closed system.
Avogadro's Law states that the volume of a gas is directly proportional to the number of moles (or number of particles) of gas when the temperature and pressure are held constant.
Charles’ Law is the volume of a gas at constant pressure is directly proportional to the absolute temperature.