So let's look at the conditions under which this law holds. So this law will only work when our pressure and temperature are both held constant. And what this law tells us is that volume is directly proportional to the number of moles. And what that means. If these guys are held constant, the only way we can increase our volume of our system is to add more gas or to add more moles of gas. Now, if we multiply this side by some constant, this we set equal and our N comes to this side.