Why incandescent bulb tungsten wire put a small amount of red phosphorus
This causes the lamp to form a vacuum mode. When the lamp is in operation, the tungsten wire in the bulb is heated, because there is no oxygen, so it does not form oxidation to the tungsten wire, so that the tungsten wire can be protected.
Red phosphorus used as a deoxidizer, the oxygen reaction to prevent the tungsten wire is oxidized, easy to blow.
Filament hot ignition of phosphorus, digestion of the bulb in the oxygen, tungsten wire will not be oxidized
In the bulb, red phosphorus and a small amount of oxygen reaction to produce phosphorus oxide, chemical formula: 2P +5O2 = 2P2O5
