The tiny bubbles, therefore, explode in size. The potential two-bottle volume of carbon dioxide gas that was dissolved in the liquid under two atmospheres of bottling pressure is now at only half bottling pressure. The two-bottle gas volume abruptly comes out of solution. Note that swirling whirlpool eddies are essential for getting soda to spew. Why little bubbles form along the bottom and the sides of a cup containing carbonated drinks , WonderQuest.
Clouds in a Glass of Beer by Craig F. April Holladay lives in Albuquerque, New Mexico. Her column, WonderQuest, appears every second Monday of the month on globetechnology. To read April's past columns, please visit her website. If you have a question for April, visit this information page. You can also comment on this article at Google Groups. Follow us on Twitter: globetechnology Opens in a new window. Report an error. Editorial code of conduct. Skip to main content. April Holladay. Follow us on Twitter: globetechnology Opens in a new window Report an error Editorial code of conduct.
The gas also comes out more quickly when the can is warm because carbon dioxide is less soluble in warmer liquids. Carbonated Soft Drinks. Yeasts are the most important spoilage organisms since they can grow at acidic pH and under anaerobic conditions. Due to the low pH, most bacteria, including pathogenic bacteria, die off rapidly in this type of beverages.
The first thing to go bad with any soft drink is the loss of CO2 the carbon dioxide which makes the soda fizz when you pour a glass. So, it is not harmful to drink soda if the bubbles begin to diminish and then eventually disappear months past the best by date , but it will taste flat. Carbonated soft drinks or sodas are not perishable, and are safe past the date stamped on the container.
Eventually flavor and carbonation will decrease. For best quality, consume unopened diet sodas within 3 months after the date expires; regular sodas within 9 months. According to the New York Times, expired soda is safe to drink. An article about expired Coca Cola stated that even soda old enough to grow mold poses very little health risk.
The key question is if it was in a glass bottle, plastic bottle or can. Nothing in Coke can become toxic or life threatening with age. Older plastic bottles could contain BPA or other things in the plastic, which with again will also mix with the liquid as well.
At least the Coke bottle was never opened. Given enough time, the CO 2 will all leave the solution, removing all of the dissolved gas which gives the soda its fizziness. The carbonation is due to the presence of dissolved carbon dioxide gas.
The gas exerts pressure when not dissolved, which can cause it to burst from its container if too much is released. If exposed to air, the gas will slowly come out of solution and be released to the atmosphere, causing the drink to go flat. Answer 1: The bubbles in soda come from a gas called carbon dioxide that is dissolved into the soda. Answer 2: Most carbonated drinks have dissolved CO 2 carbon dioxide.
Follow-up on this answer. Learn more physics! Related Questions. Still Curious? Does tapping on the top of an unopened soda can or bottle before you drink it reduce the risk of having a "soda explosion"? If it does why does it do it?
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