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Liquid oxygen is the liquid form of molecular oxygen. It has a density of 1.141 kilograms per litre (71.2 lb/cu ft), slightly denser than liquid water, and is cryogenic with a freezing point of 54.36 K (−218.79 °C; −361.82 °F) and a boiling point of 90.19 K (−182.96 °C; −297.33 °F) at 1 bar (15 psi).
Normalair achieved most success with portable oxygen systems, including the equipment supplied for the first successful ascent, by Tenzing and Hillary, of Mount Everest. [ 3 ] Relatively short-lived was Normalair's entry into the automotive air conditioning market, where the systems were optional extras on Wolseley Wolseley 6/110 , [ 4 ] Austin ...
Medical use liquid oxygen airgas tanks are typically 2.4 MPa (350 psi). [citation needed] All equipment coming into contact with high pressure oxygen must be "oxygen clean" and "oxygen compatible", to reduce the risk of fire. [3] [4] "Oxygen clean" means the removal of any substance that could act as a source of ignition. "Oxygen compatible ...
Volunteer fire fighter exiting live burn structure wearing NIOSH-certified SCBA, NFPA compliant turn-out gear, and holding a pike pole Example NFPA 1981 regulatory label [25] In the United States and Canada, SCBAs used in firefighting must meet guidelines established by the National Fire Protection Association , NFPA Standard 1981.
The system used a copper diving helmet and standard heavy diving suit with a back-mounted set of cylinders and scrubber. Two versions were available, The DM20 for oxygen to 20 metres, and the DM40 for nitrox to 40 metres, using an oxygen cylinder and an air cylinder, and mixing the gas as it was used.
In an atmosphere that may be oxygen-deficient, or toxic, an air supply can be carried on the back. A breathing apparatus or breathing set is equipment which allows a person to breathe in a hostile environment where breathing would otherwise be impossible, difficult, harmful, or hazardous, or assists a person to breathe.