If we have molecules localized and trapped in a very small region of space, and then we open up that volume, those molecules will begin to move and disperse and spread out throughout that region of space. So what we see will happen is, over time, according to the second law of thermodynamics, those molecules that carry energy that can actually pass across these tiny pores in the membrane, will in fact pass across. And so that over time, this entire region of space that contains the water molecules also will contain these tiny red molecules, as shown in the following diagram. So this is dictated, this must happen by the second law of thermodynamics. So over time, almost all of these red molecules, the majority of these molecules in our dialysis bag, will essentially move out of our protein mixture. So over time, the majority of the small molecules, the ions, for example, will pass through the semipermeal membrane and out of the bag.