I imagine a valve like that on the bottom of a snorkle that, if pressure is built up in the soda bottle, releases the gases. It could be built into the cap. This could prevent mishaps where an accidently dropped soda explodes on pants etc.
[Edit: Sorry for the mispellings and premptive posting of idea]-- barnzenen, Jun 06 2003 A good seal http://europa.eu.in...tes/images/seal.jpgSnarfy's right. You need one. [Worldgineer, Oct 04 2004] Quibble: this will *ensure* that an accidentally dropped bottle of soda will explode, losing all its fizz, rather than merely settling down again after a few minutes if left unopened. And given the amount of shaking on the average distribution truck, this will mean that all soda will arrive at the store flat.-- DrCurry, Jun 06 2003 I believe the pressure relief part is baked. It's trivial to design the cap to be able to withstand a bit less pressure than the walls of the bottle and I believe that is the current design. As far as the venting gas, it's tough to only release gasses and not liquid. How do you propose such a device would work?-- Worldgineer, Jun 06 2003 Curry's right. What's to stop all CO2 from escaping? You need a good seal so the fizz has nowhere to go and stays in the soda.-- snarfyguy, Jun 06 2003 try walking around wal-mart one day, their everywhere.-- dickity, Jun 06 2003 seals?-- Worldgineer, Jun 06 2003 random, halfbakery