Though the density of air is low at high altitudes, the amount of oxygen present is sufficient for the combusion of fuels in aeroplanes and jets. But for spaceships where there is no oxygen in space, the ships carry liquid oxygen which is the fuel.
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How airplanes flying high get the combustion air?
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#1 by tedschram on August 27th, 2009
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there’s oxygen up there, just not enough for humans. Birds have been spotted at 37,000′. Jet planes are going fast and scoop up a lot of air, so they get enough.
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#2 by Queen Bee on August 27th, 2009
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Though the density of air is low at high altitudes, the amount of oxygen present is sufficient for the combusion of fuels in aeroplanes and jets. But for spaceships where there is no oxygen in space, the ships carry liquid oxygen which is the fuel.
References :
#3 by Y- on August 27th, 2009
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Jet aircraft have big fans that are part of the engine that pull in the air, compress it, mix it with fuel, etc.
Piston engine airplanes that fly high are usually equipped with a turbocharger (like in cars) that do the same thing, take in the outside air, compress it and pass it on to the cyliners.
Ramjets require high speeds in order to force enough air into them to get the job done (e.g. SR-71)
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