Carbon dioxide(Carbonic Anhydride) is the compound of a carbon and oxygen and is colorless and has no sell at room temperature and air pressure. This is different with Carbon oxide which is harm to human and introduced at 1577 by Van Helmont who was interested about ‘Charcaol’. A solid type is first produced in 1863 by Thiorier and after 1924 L-CO2 is highlighted for refrigeration in the industry. L-CO2 is a transparent liquid which is 31~51 centigrade at a room temperature and usual treatable temperature is -17.8 centigrade and 21 kg/cmg air pressure.     For groceries : an additive of beer or soda For an industry : Inert Gas for machine welding, extinguishing, Tank Purge                             Gas, sealing for storage tank, charge for laser For an agriculture : plant growth quickener, storage grains, sustain degree                                 of sugar, storage for fruit and vegetables For a medicine : a part anesthetic, an insecticide, dis-infection gas,incubator For a fuel : making Urea and , Soda Ash Others : PH-control, puffing of a cigarette , butchery of stocks, a spray, a fire               extinguisher