Squeeze the bottle to prevent carbonation loss?
August 30, 2005 10:01 PM Subscribe
Does squeezing a 2-liter Coke bottle before putting the cap on help keep the Coke from going flat as quickly, or not?
posted by msittig to Food & Drink (15 answers total)
I was once told that a partially empty 2-liter of Coke can retain carbonation longer if it is squeezed before putting the cap back on. This seemed reasonable to me, as the amount of volume not taken up by the Coke inside the bottle is reduced, leaving less air for the CO2 to diffuse into. BUT, if the bottle isn't squeezed hard (resulting increases that would cause the bottle to retain its crushed shape even if the cap weren't replaced) maybe the bottle "wanting" to return to its original shape could produce a mini vacuum effect, causing the CO2 to diffuse into the space more quickly (not sure about this)? Even if the 2-liter were given a "hard squeeze" (the kind that doesn't need a cap replacement to "stick"), I'm thinking that it might actually encourage more diffusion of the CO2 because whereas an unsqueezed bottle is full of air and allows for some diffusion of CO2, a squeezed bottle can actually expand the bottle to its original shape, allowing for the release of more CO2.
This all boils down to one question: does squeezing a 2-liter Coke bottle before putting the cap on help keep the Coke from going flat as fast or not??
A Google search turns up a few answers
, but they differ on this detail. Does AskMetafilter have a more definitive answer?