why is an electric blub not filled with air?
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In Light Bulb, tungsten filament (due to its high melting temperature) is heated to extreme temperature so as to emit enough amount of visible light. However to prevent tungsten from catching fire (combustion) at these high temperatures, tungsten filament is sealed in oxygen free chamber. But creating vacuum i.e. lack of surrounding air pressure to avoid tungsten filament combustion leads to evaporation of tungsten at extreme high temperatures which gets collected inside portion of the glass of electric bulb and reduces light output. Hence in electric bulb inert gases typically argon is filled to avoid loss of tungsten due to evaporation. Also as argon is inert gas there is no chance of combustion of tungsten filament.
Riya09:
nice explanation
No, as air is a bad conductor of electricity hence a certain gas is used to light the bulb.
oh thanks , it helped me
but I think he said about led
not the normal bulb
Normal bulb
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it may crack the bulb 's outer glass due to difference in temperature of air inside and outside the bulb.
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