Originally Posted by sweetcell
i'd love to get confirmation or denial about this from someone better versed in the physics of gases, but i do not believe there is a point when all (or more) of the gas is in the head space, under high pressure, waiting to re-enter the beer. it's a constant equilibrium (re: Henry's law
). temperature will affect how much gas is in the beer vs. the headspace, but at a given temp the pressures will be in equilibrium.
again, happy to be told i'm wrong...
I've never really thought about why, i just know I can see co2 bubbles leaving the beer during an active bottle refermentation and that if open a beer after say 24 hrs or so, there's a bunch of gas and the beer is still flat.But maybe this is what you're looking for.
"... the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution."
"(A) Low pressure, low concentration of gas solubility. Decreased pressure allows more gas molecules to be present, with very little being dissolved in solution.
(B) High pressure, high concentration of gas solubility. Increased pressure forces the gas molecules into the solution, relieving the pressure that is applied, causing there to be less
gas molecules present and more of it in solution."