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Here are some friends with simlar question as we.And I have this question for many days,anyone help us?
Kitty said: Yes.What makes coca cola so fizzy?-I try seach this on internet but no results found.Maybe this is a stupid question.
Mike said: oh,no,you are wrong.I have found as below for this question(What makes coca cola so fizzy?),it will help you,my kids.

I do believe that would be the carbonated water.

Carbonated water, also known as soda water, sparkling water, fizzy water, club soda, or seltzer water, is plain water into which carbon dioxide gas has been dissolved. The process of dissolving carbon dioxide gas is called carbonation. It results in the formation of carbonic acid (which has the chemical formula H2CO3).

Today, carbonated water is made by passing pressurized carbon dioxide through water. The pressure increases the solubility and allows more carbon dioxide to dissolve than would be possible under standard atmospheric pressure. When the bottle is opened, the pressure is released, allowing the gas to come out of the solution, thus forming the characteristic bubbles.

Today, carbonated water can be purchased at a grocery store, or can be made quickly and easily by using a home soda maker.

Soft drinks are often based on flavored carbonated water. Recently it has become increasingly common for flavored carbonated water (without sweeteners) to be marketed by itself as a drink.
Carbonic acid (carbonation).
it contains bug repellent...

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