Definition of Avogadro's law in English:

Avogadro's law

(also Avogadro's hypothesis)


  • A law stating that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.

    • ‘Amedeo Avogadro was an Italian physicist who lived from 1776-1856, and his main contribution to chemistry is Avogadro's hypothesis which gave us Avogadro's Law, which in turn lead to Avogadro's number.’
    • ‘It also predicted Avogadro's law that equal volumes of gases contain equal numbers of molecules and so explained Gay Lussac's law also.’
    • ‘The H 2 O formula for water - derived using Avogadro's hypothesis - implied that oxygen's atomic weight was 16.’
    • ‘This is the basic theory behind Avogadro's law.’
    • ‘The next of the gas laws is known as Avogadro's law.’
    • ‘This hypothesis lead to Avogadro's law, which states that the volume of a gas maintained at constant temperature and pressure, is directly proportional to the number of moles of the gas.’


Avogadro's law