Avogadro's Law states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules. In simpler terms, if you have two containers with the same size and conditions, they will have the same number of gas particles, regardless of the type of gas.
Avogadro's Law very simplified
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Gas volume.
1 sentence
Equal volumes of gases at the same temperature and pressure contain the same number of molecules.