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Various cycles are used to obtain individual gases. Zeolites are used with compressed air streams to selectively remove water vapor, concentrate nitrogen, concentrate oxygen (and argon). For larger industrial processes, air is compressed to very high pressures, allowed to cool to ambient temperature, then the pressure is rapidly dropped. The gases liquify (or freeze into "snow"), and can be separated by boiling point (among other things) as needed.

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16y ago

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