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A gas-filled filament bulb, the gas used is

  • A gas-filled filament bulb, the gas used is Nitrogen.
  • Nitrogen is a commonly used gas in filament bulbs because it is an inexpensive and abundant gas that is inert and non-reactive at normal operating temperatures.
  • Nitrogen gas can help to protect the filament from oxidation and slow down the rate of evaporation of the filament material, which can extend the lifespan of the lamp.