Phosphorus oxide can refer to:

  • Phosphorus pentoxide (phosphorus(V) oxide, phosphoric anhydride), P2O5
  • Phosphorus trioxide (phosphorus(III) oxide, phosphorous anhydride), P2O3
  • Phosphorus tetroxide, P2O4
  • Several other, less common, oxides of phosphorus, including P4O7, P4O8, P4O9, and P2O6

Gases:

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