watching too much sci fi

but any way,
how do the shuttle's thruster jets work?

and my real question is why don't they just use compressed air?

with compressed air, they could just draw down some of the crew consumables
and use some sort of mechanical compressor, to compress the hell out of it,
and then use this pressure to blast themselves into the wanted position?


In zero G --
what does their thruster fuel give them over compressed air??



thanks for any info

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