Answer :

Final answer:

White phosphorus (P4) is stored underwater or in an inert environment to prevent its spontaneous ignition in air.

Explanation:

White phosphorus, also represented as P4, is highly reactive and spontaneously ignites in air, meaning it must be stored carefully to prevent combustion. White phosphorus rounds must be stored underwater or in an inert atmosphere. When stored underwater, it is protected from exposure to oxygen, thus preventing it from igniting. The two main storage positions for safety are either submerged in water or within a sealed environment filled with an inert gas such as nitrogen. These methods prevent the oxygen in the air from coming in contact with the white phosphorus which would otherwise lead to its autoignition.

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