CO2 is used in carbonated water products as it easily absorbs into a liquid including soft drinks to forms tiny bubbles. The carbon dioxide serves as a protective measure that keeps the soft drink fresh and prevents the growth of bacteria in the liquid while stored.
CO2 in the form of carbonated water acts in the orosensory pathways by, for example, robustly stimulating the somatosensory system.
At normal temperature, gaseous carbon dioxide is not very reactive. The carbon dioxide molecule is relatively stable and does not readily break down into simpler compounds.
CO2 is produced by body metabolism and is a normal component of exhaled breath. It also results from the burning of fossil fuels and natural sources such as volcanic eruptions. CO2 levels in outdoor air typically range from 300 to 400 ppm (0.03% to 0.04%) but can be as high as 600-900 ppm in metropolitan areas.
Carbon dioxide
