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Approximately 20% of the [[atmosphere]] is made up of oxygen.
Approximately 20% of the [[atmosphere]] is made up of oxygen.
Oxygen in a concentrated form is explosive]]. It is the component of all [[combustion]] reactions and produces [[carbon dioxide]].
[[Category:Chemistry]]
[[Category:Chemistry]]
[[Category:Elements]]
[[Category:Elements]]
[[Category: hydrogen economy]
[[Category: hydrogen economy]]
[[Category:gasses]]
[[Category:gasses]]