Now, what will entropy tell us about this situation? Well, entropy will tell us that our system is not even and we will want to move towards a more even system. In other words, some of these guys will want to move inside the cell so that we have the same number of ions on the inside as outside. So at this point, we say there's a high concentration gradient or high chemical gradient on the outside. And the concentration gradient simply comes from the number of molecules. The more molecules they are, the higher the concentration gradient.