What is the relationship between the number of gas particles and volume?

The relationship between the number of gas particles and volume is described by the ideal gas law, which states that, at constant temperature and pressure, the volume of a gas is directly proportional to the number of gas particles (or moles). This means that as the number of gas particles increases, the volume also increases, provided that temperature and pressure remain constant. This relationship reflects the behavior of gases, where more particles occupy more space due to their constant motion.