What is the primary focus of Avogadro's Law in relation to gas volume?

Avogadro's Law states that at constant temperature and pressure, the volume of a gas is directly proportional to the number of molecules of that gas. This fundamental principle implies that if you increase the number of gas molecules while keeping temperature and pressure constant, the volume of the gas will also increase. Conversely, reducing the number of molecules will decrease the volume. This relationship emphasizes the importance of the number of particles in determining the behavior of gases.

The focus on how the volume changes in response to the quantity of gas makes this law crucial in understanding gas behavior under varying conditions, particularly in stoichiometry and in the ideal gas equation.