Avogadro's hypothesis

This hypothesis states that all gases, under the same conditions of temperature and pressure, contain the same number of particles, thereby explaining the relationship between the volume and number of particles of a gas.
 Amedeo Avogadro Italy 1811 Avogadro's hypothesis

This hypothesis states that all gases, under the same conditions of temperature and pressure, contain the same number of particles, thereby explaining the relationship between the volume and number of particles of a gas.