![]() One trick to reduce the amount of bubbling during pouring - and thereby enabling a soft drink to stay fizzy longer - is to pour the soda along the side of the glass. ![]() That foam is all gas coming from the beverage." "If you pour a beer into a glass, you can get a good size head of foam on top, depending on the kind of beer and how carbonated it is. "A good example of this can be seen with beer," Glajch said. ![]() Soda fizzes even more when it is poured into a glass because the act of pouring greatly increases the surface area of the liquid and helps the bubbles escape, Glajch said. The result is that most of it fizzes out of the liquid as tiny CO2 bubbles. Henry's law suggests that when soda is exposed to air, the carbon dioxide in the soft drink naturally wants to reach the same concentration in the fluid as in the air. Why do you usually eat the same thing for breakfast?Ĭarbon dioxide makes up about 0.04% of Earth's atmosphere, according to Columbia University's Climate School. Why does eating pineapple make your mouth tingle? (If a can or bottle has been shaken or otherwise disturbed before it is opened, gas trapped within the liquid can escape to join the gas above the beverage, increasing the pressure in the gas above the fluid and resulting in the soda bursting out when the container is opened.) "A soda bottle is effectively a pressure vessel that will hold that pressure in until you open the top," Jones said. This venting gas produces the signature hiss one expects to hear from a newly opened soda bottle or can. However, when a soda container is opened, the pressurized carbon releases into the air. Because of Henry's law - and the pressure of the gas trapped at the top of the sealed container - the carbon dioxide that's dissolved in the beverage stays within the fluid. When soda is canned or bottled, the space above the drink is usually filled with carbon dioxide at a pressure slightly above that of standard atmospheric pressure (about 14.7 pounds per square inch, or 101.325 kilopascals), Glajch said. Henry's law states that the amount of a gas dissolved in a liquid is proportional to the pressure of that same gas in the liquid's surroundings. "Warming up a liquid forces gas out of the solution," Joe Glajch, an analytical chemist and pharmaceutical chemistry consultant, told Live Science.Īfter soda is infused with carbon dioxide, the gas effervescently escapes due to a principle in physical chemistry known as Henry's law, proposed by British chemist William Henry in 1803, according to Britannica. When soda is bottled, the soft drinks are kept very cold because carbon dioxide dissolves better in soda at low temperatures. Although the carbonic acid and any other flavor-enhancing acids that soda-makers add to soft drinks has been linked to tooth damage, "I think the American Dental Association is more concerned about the sugar in soda," Jones said. In 1886, pharmacist John Pemberton in Atlanta, Georgia, invented Coca-Cola, the first cola drink.Ĭarbonation not only leads to a dancing froth, but also reacts with the water to generate carbonic acid, resulting in a slightly tangy flavor. Flavors were added later - ginger by about 1820, and lemon in the 1830s.
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