Suppose I take this cloth, I soak it up in hydrochloric acid and then plug it up as well. So it's plugged up on both sides and I have air molecules in the middle. So orange guys are air molecules, green guys armonia molecules and red guys are hydrochloric molecules. So what will happen? Well, some of these guys will evaporate and some of these guys will evaporate and they will begin moving. But they won't move directly from this point to this point.