[dangerdoc]

White phosphorus burns when exposed to water that’s what makes it such a fun military tool.

[Oztrich Boy]

White phosphorus burns when exposed to water that’s what makes it such a fun military tool.

It doesn't burn when exposed, it's just that if burning, water won't extinguish it.

[NathanR]

Phosophorus burns when exposed to air. Water puts it out. Sodium burns when it touches water.