Re:The ingenious design of the aluminum beverage can (2015) ...
by londons_explore on Friday February 03, 2023 @10:36AM
(#34642434)
Carbonation is an odd process... You can carbonate a liquid (by bubbling CO2 through it at high pressures). That liquid, if put in a cup, will slowly lose its carbonation, over a few hours.
If you put a sealed lid on the cup, the pressure will build up inside the cup as some CO2 comes out of the liquid into the top of the cup, till there is an equilibrium and no more gas comes out.
Thats what the canning process relies on. So the can isn't sealed under pressure - the can is sealed at room pressure, and then within a few minutes the pressure builds up inside the can.
Re:The ingenious design of the aluminum beverage can (2015) ...
by bena on Friday February 03, 2023 @11:59AM
(#34643906)
That makes sense as to why two liters go flat faster. The more you drink, the more space in the bottle. The more space, the more CO2 that would be allowed to escape the liquid.
If you put a sealed lid on the cup, the pressure will build up inside the cup as some CO2 comes out of the liquid into the top of the cup, till there is an equilibrium and no more gas comes out.
Thats what the canning process relies on. So the can isn't sealed under pressure - the can is sealed at room pressure, and then within a few minutes the pressure builds up inside the can.
Kinda neat!