I was recently looking at a Wurlitzer juke box, and noticed something strange. It's decorated with liquid-filled tubes. Gas bubbles are injected at the bottoms of the tubes, and the bubbles naturally rise.
What was strange was that, as the bubbles rise, they shrink! Not just a little bit, but very noticeably. At first I assumed it was some kind of optical illusion, but actually many bubbles shrink down to nothing and disappear. How can this be? Where does the gas go? Surely it can't be dissolving into the liquid. It can't happen that fast, and the liquid would be saturated by now.