a white, deliquescent, crystalline powder, P 2 O 5 , that, depending upon the amount of water it absorbs, forms orthophosphoric acid, metaphosphoric acid, or pyrophosphoric acid, produced by the burning of phosphorus in dry air: used in the preparation of phosphoric acids, as a drying and dehydrating agent, and in organic synthesis.
Especially when stored, phosphorus decomposes to phosphorus pentoxide and then phosphoric acid in moist environments.
These emissions are also primarily phosphorus pentoxide.
phosphorus pentoxide is made commercially by burning phosphorus in a stream of air.
Desiccants generally used include: anhydrous calcium sulfate, silica gel, or phosphorus pentoxide.
British Dictionary definitions for phosphorus pentoxide
a white odourless solid produced when phosphorus burns: has a strong affinity for water with which it forms phosphoric acids. Formula: P2O5 (commonly existing as the dimer P4O10) Also called phosphoric anhydride