 ##  [Avogadro's Law](/avogadros-law) 

  ##  [Avogadro's Law](https://natural.quantumdictionary.io/avogadros-law-0) 

  
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**Natural &amp; Formal Sciences Dictionary**

 
Definition

The principle that equal volumes of ideal gases, at the same temperature and pressure, contain the same number of constituent particles (molecules or atoms); equivalently, at fixed T and P the volume is proportional to the amount of substance n.