Carbon Dioxide (CO2) is a naturally occurring chemical compound composed of two oxygen atoms bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in earth’s atmosphere. Carbon dioxide (CO2) is colorless. At low concentrations, the gas is odorless. At higher concentrations it has a sharp, acidic odor. At standard temperature and pressure, the density of carbon dioxide is around 1.98 kg/m3, about 1.67 times that of air. Carbon dioxide has no liquid state at pressure below 5.1 standard atmospheres (520kPa).
Carbon Dioxide is widely used by the food industry, the oil industry and the chemical industry. In the Chemical Industry, carbon dioxide is mainly consumed as an ingredient in the production of urea and methanol. It is used as a propellant and acidity regulator in the food industry. Carbon dioxide is used to produce carbonated soft drinks and soda water. It is one of the most commonly used compressed gases for pneumatic (pressurized gas) systems in portable pressure tools. Carbon dioxide extinguishes flames and some fire extinguishers, especially those designed for electrical fires, contain liquid carbon dioxide under pressure. Liquid and solid carbon dioxide are important refrigerants, especially in the food industry, where they are employed during the transportation and storage of ice cream and the other frozen foods.