Question
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
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Answer
If air is filled in an electric bulb, then the extremely hot tungsten filament would burn up quickly in the oxygen of air. So, the electric bulb is filled with a chemically unreactive gas like argon or nitrogen. Thes gases do not react with the hot tungsten filament and hence prolong the life of the filament of the bulb.
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