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In incandescent electric bulbs the tungsten filament gets white-hot, reaching about 2000 degree centigrade and glows to emit light. Any reactive gas or air filled in the bulb will react with the hot filament and combust it. Hydrogen, Oxygen and Carbon dioxide all are prone to reaction. Hence inert gas like Argon or Nitrogen - which is known as a noble gas - is used to stop the combustion and evaporation of the filament.