Birth of Avogadro’s law
In 1811, Italian scientist Amedeo Avogadro proposed a hypothesis that would later become known as Avogadro’s Law. At the time, scientists struggled to explain the relationship between the volume of a gas and the number of particles it contained. Avogadro suggested that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules. Though his idea was initially overlooked, it eventually became a fundamental principle in chemistry, helping to establish the modern concept of the mole and the ideal gas law.