Why does a balloon of #2*L# volume contain TWICE as many gaseous particles as a balloon of #1*L# volume under equivalent conditions of pressure and temperature?
Would you not expect this outcome?
And this relationship was experimentally confirmed by Amadeo Avogadro. The volume occupied by a gas is directly proportional to the number of gaseous molecules present in the container:
Historically, this gas law was important because it led to the idea of molar equivalence, and
Certainly, this is the behaviour we observe when we blow up a balloon.