The principle of fire equipment fire extinguishers 

 According to the carbon dioxide has a high density, about 1.5 times that of air, and developed a fire equipment fire extinguishers. At atmospheric pressure, liquid carbon dioxide is immediately vaporized, general 1kg of liquid carbon dioxide can produce about 0.5 cubic meters of gas. Thus, fire fighting, the carbon dioxide gas can be ruled out air surrounded by the combustion of the object surface or distributed in a more confined space, reducing the oxygen concentration around combustible or protective space, resulting in a stifling effect and fire fighting. In addition, carbon dioxide ejected from the storage container, the liquid rapidly vaporized into a gas, attract some heat from the surrounding, play the role of cooling. 

 This product is provided by the Xi'an fire equipment (www.xfqcw.net)