A colorless, odorless, tasteless, non-explosive and inert gas, CO2, formed during respiration, combustion, and organic decomposition and used in food refrigeration, carbonated beverages, inert atmospheres, fire extinguishers, and aerosols. Tank sizes available are 20 POISONOUS!and 50 pounds. Also called carbon dioxide, carbonic acid, and, in aqueous solution it's called carbonic acid gas. Solid carbon dioxide, or dry ice, is a refrigerant. Toxic if inhaled in large amounts.Also see acetylene, argon, helium, hydrogen, nitrogen, and oxygen.