"There are several reasons why beer goes flat - the most common for beer we have at home being simple age and temperature fluctuations. Changing temperatures - especially warmer temperatures - causes a release of the beer's carbon dioxide. With age, that CO2 becomes a lot less active, too - and it doesn't discriminate. Even the best, most popular beers will suddenly become less pleasant to imbibe if their bubbles are gone."
"One genius solution is to make beer ice cubes. That's right, just pour that flat beer into your ice tray. You may be wondering if it will actually freeze, considering many of us store things like vodka in the freezer. That's because the higher content of alcohol present, the lower that drink's freezing point. Beer's average ABV range is about 4% to 7% and even boozier beers will freeze unlike a strong spirit,"
"When creating these cubes, make sure the beer's only fault is flatness and not an off-flavor like skunkiness. A skunked beer is one that has been exposed to UV rays of light and develops an unmistakable smell. If you freeze skunked beer, you'll only have skunky ice cubes. It's also important to pour beer out into ice trays rather than just freezing it in its cans. As it freezes, the beer expands and could eventually explode."
Beer loses carbonation mainly due to age and temperature fluctuations, with warmer temperatures releasing dissolved carbon dioxide and aging reducing CO2 activity. Flat beer retains flavor despite lacking bubbles, allowing alternative uses. Typical beer ABV of about 4–7% permits freezing, so flat beer can be poured into trays to make ice cubes. Beer ice cubes work for cooking, cooling beer cocktails, or chilling fresh beer without diluting it. Avoid freezing skunked beer because UV-exposed beer retains off-flavors. Pour into trays rather than cans to prevent expansion and possible explosions during freezing.
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