Why is electric bulb protected with glass?
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Incandescent light bulbs usually contain a stem or glass mount attached to the bulb's base which allows the electrical contacts to run through the envelope without gas/air leaks. ... The enclosing glass enclosure contains either a vacuum or an inert gas to preserve and protect the filament from evaporating.
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This is because In the presence of oxygen, the filament would burn up as a result of the high temperature. A glass bulb, then, is used to keep oxygen away from the filament.
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