I mean no gases were leaked from the bottle while the cap is closed so why is it doing that.
In: Chemistry
The gases leaked out when you opened it the first time, and that gave the pressure time to equalize between inside and outside the bottle, so there’s no need for that to happen again unless something causes another change in the pressure. You can increase the pressure in the bottle again after closing it and make it hiss again when you open it, but unless this is done intentionally, it won’t usually happen.
When you shake a bottle of soda, the dissolved CO2 gets mangled at the imperfections of the bottle ready to release the soda fountain. The longer you keep that bottle closed, the more time you give the CO2 to get away from that surfaces it can form bubbles.
The first time you open it, it has been shaken up on the way to get to you (for example in the truck on the way to the store from the factory), so some of the gas in the soda leaves the fluid and increases the pressure in the bottle. When you open the bottle, that pressure escapes. Now if you close it and don’t shake it up, the gas in the soda stays in the soda so the pressure doesn’t go up. Also, you already lost some of the gas the first time you opened it, so even if you shake it a second time, there will be less gas available in the soda to escape and cause the pressure to go up.
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