And so a lot of the carbon dioxide found above the liquid in a soda can dissolves in the liquid. But when you open the liquid, the pressure decreases because there's an influx or an alflux of molecules out of the can. And therefore the alflux creates a lower pressure. A lower pressure means Solubility decreases. A lot of the molecules will leave the liquid and you will get a stale tasting soda. The second thing that influences solubility of gases is temperature.