Gay-Lussac's Law

Now we know:  `(P_1\ \ V_1)/T_1=(P_2\ \ V_2)/T_2`

and we know Gay-Lussac's law `=` Volume constant

If we choose ONE for the value of `V`

NOTE: It doesn't really matter what value you choose, they will cancel each other out being the same

then  `(P_1xx1)/T_1=(P_2xx1)/T_2`

is the same as

`P_1/T_1=P_2/T_2`

This is Gay-Lussac's law