Who was Amedeo Avogadro?
Amedeo Avogadro 1776- 1850 was the person who came up with the hypothesis that equal volumes of gases contain equal number of particles.
The Avogadro's hypothesis was critical to the development of Chemical theory. The idea that equal volumes contain equal number of particles at equal temperature and pressure was key to the development of the atomic, molecular theories of matter.
Though Avogardro hypothesis is now accepted as fact it remained a hypothesis for years, and so is still referred to as a hypothesis. He proposed his hypothesis in 1811. The idea was based on a brilliant hunch. Avogardro's Law is basic to the fundamental gas laws. Charles Law, Boyle's Law, Guy Lussac's Law, and the combined gas laws.