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. We get the following relation. Volume over N, our number of moles equals a constant. Now this constant, which we will see next when we learn about the ideal gas law, depends on temperature and pressure.