Obviously the hiss is co2 escaping from the bottle. But what I don’t get is why if I turn the cap just a little it’ll hiss then no more air will come out. Even if I squeeze the bottle no more air will come out. I can turn the cap a little more and get another hiss and I can repeat until all the gas is out.
In: Physics
Because, as you turn the cap you decrease the amount of pressure the cap can maintain. As gas escapes from the bottle, the pressure equalizes to what the (now partial) seal can maintain. Eventually the seal is completely broken and the pressure inside the bottle matches the pressure outside.
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