Editing Oxygen (section)

==Storage==
[[File:Compressed gas cylinders.mapp and oxygen.triddle.jpg|thumb|Oxygen and [[MAPP gas]] compressed-gas cylinders with regulators]]

[[Oxygen storage]] methods include high-pressure [[oxygen tank]]s, cryogenics and chemical compounds. For reasons of economy, oxygen is often transported in bulk as a liquid in specially insulated tankers, since one [[litre|liter]] of liquefied oxygen is equivalent to 840&nbsp;liters of gaseous oxygen at atmospheric pressure and {{convert|20|C|F}}.<ref name="NBB300" /> Such tankers are used to refill bulk liquid-oxygen storage containers, which stand outside hospitals and other institutions that need large volumes of pure oxygen gas. Liquid oxygen is passed through [[heat exchanger]]s, which convert the cryogenic liquid into gas before it enters the building. Oxygen is also stored and shipped in smaller cylinders containing the compressed gas; a form that is useful in certain portable medical applications and [[oxy-fuel welding and cutting]].<ref name="NBB300" />