why an electric bulb is filled with N & argon instead of air
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The answer is if there was air in bulb it would have burnt in few seconds.Because the filament, which becomes extremely hot when the light is on, would rapidly oxidize and burn . Instead the bulb is filled with argon, which is inert.
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To avoid the oxidation of the filament and to increse the life span of the bulb ,its filled with the inert gas
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