State Avogadro's law (Hypothesis).

(N/A) Avogadro's law states that equal volumes of all gases under the same conditions of temperature and pressure contain an equal number of molecules.
Mathematically,this can be expressed as $V \propto n$ at constant temperature $(T)$ and pressure $(P)$,where $V$ is the volume and $n$ is the number of moles (or molecules).
This implies that if different gases are kept in containers of equal volume at the same temperature and pressure,they will contain the same number of molecules.
This law is also known as Avogadro's hypothesis and is fundamental in understanding the kinetic theory of gases.