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Recently, Weibo reported that a boy in Shanghai exploded when he opened a frozen canned cola, and he was scratched on his cheek by a flying cap and sewed more than 30 needles. Does the cola really explode after freezing? Can other canned beverages explode after freezing? In this issue of Science Life, the reporter invited Liu Shijun, a professor at the School of Chemistry and Chemical Engineering at Central South University, and Huang Shengxiang, a lecturer at the School of Physics, to conduct an analysis.
the reason
Volume expansion? Can the cans be too thin?
"When the temperature is too low, the volume of the liquid will increase. After chilling freezes, the volume of the cola will continue to expand, to a certain extent, the can body will be deformed, or even be destroyed." Huang Shengxiang said, this may be caused by the explosion One reason.
Liu Shijun said that there is a possibility that Coke could be placed in an environment at or below 0 °C , but the possibility is small. “Cola is a carbonated beverage that contains a lot of carbon dioxide and is a saturated solution. The solubility of the gas will change with the temperature. When the cola is frozen, the temperature will drop and the originally dissolved carbon dioxide will precipitate. This will cause more pressure inside the tank. "When you take out the refrigerator, it is impossible for the ice to melt quickly, but the gas expands rapidly after the temperature rises, and therefore it may explode when opened.
However, some industry insiders pointed out that the direct cause of the cracking of the Coke cans may be that the cans are getting thinner and thinner and the carbon dioxide gas is being used more and more, so that the entire body of the cans does not seem to change, but it will be greatly reduced in terms of safety.
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Carbonated drinks are prohibited from freezing below 0°C
The explosion of frozen cola was not the first time. Many netizens said that they had similar experiences as a child. Someone once put canned cola in the freezer of the refrigerator and heard the explosion before he could wait for it. The shell netting netizen “crawling the roof of the piglet†said, “When I was young, a can of Coke that was frozen was fried. Fortunately, I was not injured. I was just shaken by tinnitus.†It was also suggested that in addition to canned carbonated drinks, glass bottles The drinks are also not suitable for freezing. "My father's beer was put in the freezer and forgot to take it out because it exploded several bottles."
The reporter visited the drink area of ​​a large supermarket and discovered that all carbonated beverages include cola, sprite, etc. Whether canned or bottled, the packaging is marked with “No heating or frozen below 0 °C †to avoid direct sunlight and high temperatures. A supermarket worker told reporters that whether it is frozen or high temperature, the gas in the carbonated beverage will be discharged in large amounts, once the bottle exceeds the tolerance range, it will burst.
"If you want to drink frozen beverages, you can hold it in an open container and put it into the freezer. Never put closed carbonated drinks or bottled drinks directly into the freezer," the expert advises. In addition, when opening the bottle cap, it is also necessary to pay attention to safety. Do not put the bottle on the mouth. If you find that the beverage has swelled, you must be careful to avoid injury.
Science knowledge
Gas solubility: At a certain temperature and pressure, the highest amount of dissolved gas in a certain amount of solvent is called the solubility of the gas. Apart from gas nature and solvent properties, gas solubility is also related to temperature and pressure. Its solubility generally decreases with increasing temperature. Due to the large volume change when the gas dissolves, its solubility increases significantly with pressure. Big.
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