State Avogadro's Law and Gay-Lussac's Law.

(N/A) Avogadro's Law: Equal volumes of all gases at the same temperature and pressure contain an equal number of molecules. Mathematically,$V \propto n$ (at constant $T$ and $p$).
Gay-Lussac's Law: At a constant volume,the pressure of a fixed amount of a gas is directly proportional to its absolute temperature. Mathematically,$p \propto T$ (at constant $n$ and $V$).