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What You'll Get
- $12 for $20 Value ($20 value)
Carbonation: Beer’s Fifth Element
Whether black or tan, light or dark, ale or lager, just about all beer shares one trait: carbonation. Check out Groupon’s study of this natural process and toast beer’s bubbly side.
Scrutinize the contents of just about any bottle of beer and you’ll find it includes more than just hops, malted grain, water, and yeast. No matter how basic or old fashioned the brew, it’ll almost invariably be infused with something else, an elemental presence that is not necessarily part of the beer but that is nonetheless integral to its character: carbon dioxide. Carbon dioxide is a soluble gas, which means it becomes trapped in water—in this case, the water content of beer—under pressure. Releasing that pressure causes the CO2 to instantly revert to a gas, separating from the water molecules and rising in effervescent beads.
Carbon dioxide occurs naturally in beer—it’s created, along with alcohol, when yeast devours glucose (sugar) during fermentation. However, fermentation doesn’t usually take place in a pressurized environment, so much of the CO2 escapes along the way. To make up for this, brewers have two options: they can either try to trap the gas before the yeast has finished fermenting—as is done with cask-conditioned ales—or, using modern machinery, inject CO2 directly into the liquid afterward (much like artificially carbonating soda or seltzer). Although artificial carbonation has become the industry standard in America, many European brewers (and beer drinkers) prefer the natural approach, which is sometimes associated with a less fizzy mouthfeel.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. May be repurchased every 180 days. Must purchase 1 food item. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. Not valid for Buffalo Bills, Buffalo Sabers, Chicago Cubs, and Ohio State games. Not valid for happy hour specials or with any other specials or offers. Entire voucher value must be used in one purchase. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.