Question

why is bulb of filament lamps filled with inert gases or nitrogen?

Answer 1

Explanation:

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:

because nitrogen prevents the filament of the bulb from melting

that's why bulb of filament lamps filled with inert gases or nitrogen?