The Science Behind the Fizz
Fizz from your canned drinks comes from carbon dioxide gas that has dissolved and bonded with water under pressure from the can. This gas stays trapped until you open the container, hence the distinctive “tss-crack” sound when you open a can. You can also understand this phenomenon by putting Mentos in Coke and seeing it react with the carbon dioxide. What’s curious though is that Diet Coke is actually less dense than water, causing it to float, while regular Coke will sink. This is due to the massive difference in sweetener usage, since aspartame is so much more potent than sugar. Less sweetener, less weight; less weight, lighter than water.