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When alcohol is left alone, the content becomes stronger due to fermentation. Wines and alcohol, though, can only reach a certain level of fermentation due to the yeast that is in them. Once the content reaches a certain level, the yeast dies off, hence stopping further fermentation and possibly destroying alcohol content. So, to say that alcohol content disappears when you leave a beer open depends on some factors. What alcohol content is the beer, has it been stored at a cold temperature, is the carbonation affecting it, all though I believe it would be safe to say the alcohol content would (at least some) still be in tact, it's the freshness of beverage and the quality. Would you really want to drink it? And how many days has it been opened. I know that wine required specific storing conditions or it will go bad due to residue and wine particles gathering and spoiling the wine, but am uncertain if the same principles apply to beer.

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14y ago

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