Oxygen has historically been obtained by fractional distillation of liquid air, but is increasingly obtained by non-cryogenic technologies such as pressure swing adsorption ( PSA ) and vacuum-pressure swing adsorption ( VPSA ) technologies.
42.
Further work showed that more performance could be gained by extracting only the oxygen from the liquid air, a system they referred to as " Air Collection and Enrichment System ", or " ACES ".
43.
Meanwhile, the main Van Nuys plant was also involved in research into new systems, including a nuclear-powered ramjet for Project Pluto and a liquid air cycle engine ( LACE ) for the Air Force's Aerospaceplane efforts.
44.
Fog produced with liquid air does not present the hazards of carbon dioxide or liquid nitrogen because the liquid air has the same composition as ordinary atmospheric air ( including the same level of breathable oxygen ).
45.
Fog produced with liquid air does not present the hazards of carbon dioxide or liquid nitrogen because the liquid air has the same composition as ordinary atmospheric air ( including the same level of breathable oxygen ).
46.
A pilot cryogenic energy system that uses liquid air as the energy store, and low-grade waste heat to drive the thermal re-expansion of the air, has been operating at a power station in Slough, UK since 2010.
47.
So given that the earth s mean density is only about 6.3 times that of liquid air, and given that the pressure at the bottom of the earth s MrRedact 21 : 14, 15 November 2007 ( UTC)
48.
The problem in the igniter fuel lines was not detected during ground testing because a stainless steel mesh covering the fuel line became saturated with liquid air due to the extreme cold of the liquid hydrogen flowing through it.
49.
:Temperatures close to absolute zero can be reached only by liquefying helium, which previously has usually required a high-pressure cascade system of refrigeration, whereby liquefying helium gives up its heat to liquid hydrogen, which in turn is cooled by liquid air.
50.
Given the equation for terminal velocity, and given that the density of liquid air is about 710 times greater than air at the surface, that means that Mr . Cuddlypants terminal velocity at about 55km down is already down to only about 2 m / s.
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