To prevent oxidation of the filament. An electric bulb is filled with nitrogen or argon gas instead of air this is done to reduce the evaporation of tungsten which would otherwise condense on the bulb and Blankenship it.
WHY ARE ELECTRIC BULBS FILLED WITH CHEMICALLY INACTIVE NITROGEN OR ARGON ? The closed glass chamber of the bulb contains, an inactive (inert) gas, Argon. The glass chamber can’t be filled with air as the presence of oxygen will cause the filament to burn, i.e. react with oxygen. The glass chamber can’t be made vacuum.
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To prevent oxidation of the filament. An electric bulb is filled with nitrogen or argon gas instead of air this is done to reduce the evaporation of tungsten which would otherwise condense on the bulb and Blankenship it.
Newton D
WHY ARE ELECTRIC BULBS FILLED WITH CHEMICALLY INACTIVE NITROGEN OR ARGON ? The closed glass chamber of the bulb contains, an inactive (inert) gas, Argon. The glass chamber can’t be filled with air as the presence of oxygen will cause the filament to burn, i.e. react with oxygen. The glass chamber can’t be made vacuum.