Vacuum sealing is a good subject for research. Several years ago I bought a little item called the VacuVin, or something like that,...it was supposed to keep your opened bottles of red wine from turning crappy overnight,.....it never did. And I wondered why. I yanked on that stupid little pump till I thought the bottle was gonna cave in.
From what I understand, at least in the case of red wine, it's the exposure to oxygen that causes the wine to begin to deteriorate, not the lowered barometric pressure inside the bottle as compared to that of the dining room.
Which makes me also wonder if vacuum sealing a can or jar of tobacco has any effect at all...other than decreasing the pressure inside the container which causes the seal to be much better.
I understand the concept of vacuum sealing food inside a plastic bag,....you're sucking the bag tightly around the food and as a result removing most of the oxygen, but lowering the atmospheric pressure in a can or bottle?
Isn't the O2 still there?
Any scientists out there?