Carbon dioxide.
The fizzy sound you hear when opening a bottle of a cold drink is due to the release of carbon dioxide gas that was dissolved in the liquid under pressure. When the bottle is sealed, the pressure keeps the gas dissolved, but opening it decreases the pressure, allowing the gas to escape quickly. This rapid release of gas creates tiny bubbles, which produce the characteristic fizzing sound as they rush to the surface. Additionally, the cold temperature helps keep the gas dissolved, enhancing the effect when the bottle is opened.
gas and liquid
Solid - glass bottle Liquid - drink Gas - fizz
When you take the top off a bottle of fizzy drink, the pressure inside the bottle decreases, causing the carbon dioxide gas (which creates the fizz) to rapidly come out of the liquid. This rapid release of gas is what creates the fizzing effect that you see.
All fizzy drinks contain carbon dioxide dissolved in water (some of it forming carbonic acid). When in this dissolved state the CO2 doesn't take up much space. Shaking the bottle will release the CO2 gas .and one it is no longer dissolved it will tend to take up more space.
When you open a bottle of fizzy pop, the two substances that are lost to the air are carbon dioxide gas and some of the aromas or volatile compounds that contribute to the drink's flavor and scent.
Not sure why you need dry ice in a bottle to produce sound. Open a soda or other fizzy drink bottle and you will get the sound of the carbon dioxide gas escaping.
The gas dissolves when under pressure in a liquid. When the pressure is released the gas expands rapidly causing the fizz.
Not all fizzy drinks are bottled in plastic.
If gas comes out of solution when a bottle is opened, then there must have been a greater amount of dissolved gas in the substance while it was under pressure prior to opening the bottle.
A bottle of fizzy cola is heavier. Weight is related to mass. Whenever something loses material and doesn't gain any to replace it, it loses mass. The bottle of fizzy cola has everything the bottle of flat cola has, but the bottle of flat cola has lost some carbon dioxide. Although carbon dioxide is a gas, and doesn't weigh much more than air, the carbon dioxide in cola is compressed and dissolved and is at a higher pressure and density than carbon dioxide at normal atmospheric pressure. Therefore there is a greater mass of it present. However, the difference in weight would still not be great between the fizzy cola and the flat cola, and it would be difficult to detect.
fizzy leaves gas behind arfter you drink all of it the only thing remaing is gas