Avogadro's hypothesis (the original statement about equal volumes of gases)

Avogadro's hypothesis states that equal volumes of gases, at the same temperature and pressure, contain the same number of particles or molecules, regardless of the type of gas. This means that if you have one liter of hydrogen gas and one liter of oxygen gas, both measured under identical conditions, they will contain the same number of molecules. This principle helps explain why gases behave similarly under certain conditions and is fundamental in the field of chemistry, particularly in understanding gas reactions and stoichiometry.