Why does a carbonated beverage go flat after it has been frozen?

Answer 1

I randomly decided to search for the answer to this question so I dont know for sure, but my guess is that the crystal lattice formed by the water molecules in the beverage forces carbon dioxide molecules into the space above the liquid and then when opened the CO2 escapes. Im thinking the crystal lattice allows absolutely no extra room for molecules other than what participate in shaping it so the CO2 molecules have nowhere to go.

Answer 2

Carbonation of beer is a direct result of the temperature of the beer and the pressure of CO2 it is held under above normal atmospheric pressure of 1 atmosphere (a bastardisation of Boyles law if you want the theory). In the case of a glass of beer, no matter how cold it is kept, it is open to the atmosphere which is no differential pressure and very little CO2. The CO2 in the beer therefore wants to equalise with the atmosphere and hence escapes making the beer flat.

Solution? drink the beer.

Answer 3

because it is very porous.