For a given quantity of gas, (P_1V_1)/T_1 = (P_2V_2)/T_2P1V1T1=P2V2T2
Explanation:
Of course, when P_1 =P_2P1=P2, we get Charles' Law, V_1/T_1 = V_2/T_2V1T1=V2T2. And when T_1=T_2T1=T2, we get Boyle's law, P_1V_1 = P_2V_2P1V1=P2V2. Combining the two laws, we get PVPV==kk. Once we introduce nn, the molar quantity of gas, and a suitable constant, we get the Ideal Gas Law.