For example, liquid air can condense on a surface cooled by liquid hydrogen or helium. Nitrogen evaporates more rapidly than oxygen from the liquid air. This action leaves behind a liquid air mixture which, when evaporated, gives a high concentration of oxygen. This oxygen-enriched air now presents all of the same hazards as oxygen. Liquid Oxygen Hazard Liquid oxygen contains 4,000 times more oxygen by volume than normal air.
Many organic materials can react explosively, especially if a flammable mixture is produced.
Clothing splashed or soaked with liquid oxygen can remain highly flammable for hours. Explosion Due to Rapid Expansion Without adequate venting or pressure-relief devices on the containers, enormous pressures can build up. Unusual or accidental conditions such as an external fire, or a break in the vacuum which provides thermal insulation, may cause a very rapid pressure rise. The pressure relief valve may not be able to handle this increased pressure. OSH Answers Search Help OSH Answers Search is designed to help you specifically target items about Occupational Health and Safety that are explained in the OSH Answers portion of our site.