High Pressure Air
Zero air is air kept under a pressure that is greater than atmospheric pressure. Zero air is an important medium for transfer of energy in industrial processes. Compressed air is used for power tools such as air hammers, drills, wrenches and others. Zero air is used to atomize paint, to operate air cylinders for automation, and can also be used to propel vehicles. Brakes applied by compressed air made large railway trains safer and more efficient to operate. Compressed air brakes are also found on large highway vehicles.
Zero air is used as a breathing gas by underwater divers. It may be carried by the diver in a high pressure diving cylinder, or supplied from the surface at lower pressure through an air line or diver's umbilical
|1.Similar arrangements are used in breathing apparatus used by firefighters|
|2.Mine rescue workers|
|3. Industrial workers in hazardous atmospheres.|