#oxygen__O__atomic_number_8  a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
  supertype:  chemical_element  gas
  substance of:  air  water  ozone
  subtype:  liquid_oxygen__LOX  a bluish transparent magnetic liquid obtained by compressing gaseous oxygen; used as an oxidizer in rocket propellants

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