Question

why inert gas is filled in electric bulb​

Answer 1

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Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum. This allows for greater temperatures and therefore greater efficacy with less reduction in filament life

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Answer 2

Answer:The bulbs are usually filled with chemically inactive nitrogen and argon gases to prolong the life of filament