Question

2. A concentrated form of oxygen gas​

Answer 1

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An oxygen concentrator is a device that concentrates the oxygen from a gas supply (typically ambient air) by selectively removing nitrogen to supply an oxygen-enriched product gas stream. Two methods in common use are pressure swing adsorption and membrane gas separation.

Answer 2

Answer:

Oxygen concentration may refer to: ... Oxygen saturation, the fraction of oxygen dissolved in or carried by a fluid