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How is oxygen made and stored?

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There are three common methods for obtaining pure oxygen:

1. Air is cooled and compressed until it becomes a liquid. Then asthe liquid air warms, the oxygen "boils" off and is collected. It is then re-cooled and compressed into liquid oxygen and stored in "thermos bottles" known as reservoirs.

2. The oxygen gas is compressed and stored in heavy steel pressurized tanks.

3. Room air is pumped through a fine filter that traps all but the oxygen, which is allowed to pass through. This is known as an oxygen concentrator or oxygen enricher.




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