• In 1811, Amadeo Avogadro fixed Gay-Lussac's issue in finding ​the correlation between the amount of gas (n) and volume (V) ​(assuming temperature (T) and pressure (P) remain constant):
  

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Another form of the equation (assuming there are 2 sets of ​conditions, and setting both constants to each other) that might ​help solve problem is: P1/N1=Z=P2/N2