Even if it still makes the fizzy sound when you open it, even if there’s still visible bubbles, it always tastes flat after a day.
Why?
In: 0
The bubbles are always trying to escape. The only reason that a brand new bottle is fizzy when you get it. Is that the bubbles have filled that small gap at the top to a point where the pressure up there is strong enough to keep the bubbles in the soda.
When you crack it open and hear the fizzy sound, you have reduced the pressure and the soda immediately starts letting bubbles escape again.
If you drink lets say, half of the bottle, and then close it and put it in the fridge. The drink will still keep escaping bubbles until the gap is pressurized. But now the tiny gap is the size of half the bottle. So lots of the bubbles will escape before it equalizes again.
When you open the bottle again, you are depressurizing the half of a bottle, so you will hear the fizzy sound, but that does not mean that there is very many bubbles left in the soda.
Essentially, the less soda you have in the bottle, the more bubbles you remove every time you open the bottle. If you get down below maybe half, you should not open the bottle again unless you intend to finish it. You should also try to reduce the number of times that you open the bottle to keep the bubbles in the soda as long as you can.
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