# Charles' Law

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

and we know Charles' law `=` Pressure constant

If we choose ONE for the value of `P`

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

then `(1xxV_1)/T_1=(1xxV_2)/T_2`

is the same as

`V_1/T_1=V_2/T_2`

This is Charles' law