eli5 – why does tapping the top of a pop can make it fizz less? Or is that just a myth I’ve been practicing for 30+ years?

Question

What the title says. Pop means soda btw.

In: 1560

Answer 1

It’s a myth. Gas solubility increases as temperature decreases, so if you want to avoid foamy explosions, don’t shake your cans and keep them cold before opening. Also, if you drink 2 Liters, cool them down before opening the first time to make them stay carbonated longer. If you open them warm a lot of the dissolved CO2 escapes. Also, don’t squeeze the “air” out of 2 liter bottles. If you leave them their normal shape an equilibrium will form between the CO2 gas pressure and the dissolved CO2 vapor pressure.