Is fizzy water lighter than still?
• Fizzy or carbonated water is heavier – that is, denser – than non-carbonated water if the carbon dioxide is in solution rather than forming bubbles. For a given weight of water and dissolved CO2, the volume can be calculated by adding the volume of the water alone (about 1 millilitre per gram of water) to that of the gas (about 0.8 millilitres for each gram of CO2). So a solution of, say, 2 grams of CO2 in 998 grams of water would have a mass of 1 kilogram, a volume of…
