An average 0.75 litre bottle of champagne contains around 7.5 grams of dissolved carbon dioxide – this may not sound like a lot, but when the bottle is opened, it would release around 5 litres of carbon dioxide gas if you allowed it to bubble until flat. In an individual champagne flute, assuming a volume of around 0.1 litres, this would equate to approximately 20 million bubbles. This isn’t even the bulk of the carbon dioxide – only around 20% of it escapes from the wine in the form of bubbles, with the other 80% escaping via direct diffusion.