Is there a chemical that will take oxygen out of the air?



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    Any element that can combine with oxygen from the atmosphere would remove oxygen from the atmosphere. An example (of many) is iron or steel rusting. The iron is combining with oxygen (oxidizing) to produce iron oxide. Many reactions also liberate oxygen, so in a natural setting (no human anomalous contributions) oxygen’s proportion in the atmosphere is steady, with some rare periods of significant changes over geologic time such as about 2 billion years ago when atmospheric oxygen first began to build up.

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