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Quote from: pyrite on October 28, 2010, 11:18:42 amInteresting that oxygen will try to permeate its way through the permeable seal of the bottle cap of a beer bottle that is of higher pressure. I am just really curious to how this works.See if this helps explain it:http://www.av8n.com/physics/gas-laws.htm#sec-osmotic-flowLike I said, it's counter-intuitive, but it's physics
Interesting that oxygen will try to permeate its way through the permeable seal of the bottle cap of a beer bottle that is of higher pressure. I am just really curious to how this works.
Quote from: majorvices on August 04, 2010, 05:09:16 pmBottle caps are not impervious to o2, neither are carboys. Some oxidation still occurs. On top of that whatever oxidation that happened during transfer will also slowly change the beer.However, if the pressure inside the bottled beer is greater than the surrounding pressure, then the bottle should not intake o2, rather it should diffuse CO2, and there should be no oxidation. Unless the brewer did not carbonate the bottles correctly, then I really can't see how air will try to force itself into a bottle that ideal has a higher pressure than its surroundings.I'm not saying, I'm just saying.
Bottle caps are not impervious to o2, neither are carboys. Some oxidation still occurs. On top of that whatever oxidation that happened during transfer will also slowly change the beer.
I know, it's counter-intuitive that the O2 will force it's way into the bottle and increase the pressure. But it does. It is a case of gas/gas osmosis, and O2 can pass into the bottle because there is a higher percentage of O2 in the atmosphere than in the bottle, assuming the membrane is actually O2 permeable. It doesn't matter what the CO2 pressure is in the bottle, only what the relative O2 pressure is.
Quote from: majorvices on July 22, 2010, 05:00:30 pmIt would be a good topic if someone could give some valid explanation of why "bulk aging" is really different than "bottle aging". I can think of no real reason why this would be.The process is exactly the same. The only real difference between the two is that aging in bulk ensures greater uniformity that cannot be guaranteed in different bottles from the same batch.
It would be a good topic if someone could give some valid explanation of why "bulk aging" is really different than "bottle aging". I can think of no real reason why this would be.
Quote from: pyrite on October 27, 2010, 10:12:08 pmQuote from: majorvices on August 04, 2010, 05:09:16 pmBottle caps are not impervious to o2, neither are carboys. Some oxidation still occurs. On top of that whatever oxidation that happened during transfer will also slowly change the beer.However, if the pressure inside the bottled beer is greater than the surrounding pressure, then the bottle should not intake o2, rather it should diffuse CO2, and there should be no oxidation. Unless the brewer did not carbonate the bottles correctly, then I really can't see how air will try to force itself into a bottle that ideal has a higher pressure than its surroundings.I'm not saying, I'm just saying.Now, what the hell caused you to dig this old thread up? Even Jeff was still posting back then! Hope to see old Ben's face posting again here someday - that's for sure.
I'm glad you dug it up! I thought it died too quickly anyways, and is a good topic. Aging under water - interesting idea! Course the caps tend to rust. And a doppelbock is one of those beer that does age very nicely!
Quote from: tschmidlin on October 27, 2010, 11:44:28 pmI know, it's counter-intuitive that the O2 will force it's way into the bottle and increase the pressure. But it does. It is a case of gas/gas osmosis, and O2 can pass into the bottle because there is a higher percentage of O2 in the atmosphere than in the bottle, assuming the membrane is actually O2 permeable. It doesn't matter what the CO2 pressure is in the bottle, only what the relative O2 pressure is.Damn! You sounded smart right there, You did!
Quote from: majorvices on October 28, 2010, 10:25:24 pmI'm glad you dug it up! I thought it died too quickly anyways, and is a good topic. Aging under water - interesting idea! Course the caps tend to rust. And a doppelbock is one of those beer that does age very nicely!When aging brews under water I always use my titanium caps
Quote from: jaybeerman on October 28, 2010, 10:43:09 pmQuote from: majorvices on October 28, 2010, 10:25:24 pmI'm glad you dug it up! I thought it died too quickly anyways, and is a good topic. Aging under water - interesting idea! Course the caps tend to rust. And a doppelbock is one of those beer that does age very nicely!When aging brews under water I always use my titanium caps I just have a room filled with CO2 and wear this outfit to go get beers . . .