The carbonic acid decomposes, causing water and carbon dioxide - you see the carbon dioxide as bubbles.
The carbonation in fizzy drinks cause them to fizz.
The fizz in the drinks are from carbon dioxide.
Carbon Dioxide
its all the fizz
CO2
Fizzy drinks are not fizzy in space as there is no oxygen to fizz the bubbles. The fizz in fizzy drinks is carbon dioxide coming out. In a vacuum the liquid would "boil" because of the water vapour coming out, and would probably freeze because of all the heat removed with it. Oxygen plays no role in this at all.
Carbon dioxide gas is used to put fizz into fizzy drinks. When pressure is released, the gas bubbles out, creating the sparkling effect in the drink.
Fizz in fizzy drinks is dissolved carbon dioxide (CO2) coming out of solution. That's all that is in fizz.
Fizzy drinks fizz because they contain carbon dioxide gas that is dissolved under pressure. When the pressure is released, the gas escapes in the form of bubbles, creating the fizzing sensation.
Carbon dioxide (CO2) creates fizz in fizzy drinks through a process called carbonation. When CO2 is dissolved in the liquid under pressure, it forms carbonic acid, which gives the drink its characteristic tangy taste. When the pressure is released upon opening the bottle or can, the dissolved CO2 escapes in the form of bubbles, creating the fizzy sensation. This effervescence is what makes fizzy drinks enjoyable and refreshing.
Fizzy drinks contain acids, such as carbonic acid, to provide the tangy flavor and to enhance the carbonation process, which gives the drink its characteristic fizziness. These acids also act as preservatives to extend the shelf life of the beverage.
Soda is unhealthy because it has a large amount of sugar- that is to make drinks fizzy and match the type. It depens on how much sugar there are in other fizzy drinks. However, if you drink soda or any other fizz drinks too much, it is VERY unhealthy I hope this had helped :-)