Question

Bulbs and tube lights have a glass covering give reason

Answer 1

Answer:

A tungsten filament inside a light bulb can reach temperatures as high as 4,500 degrees Fahrenheit. A glass enclosure, the glass “bulb”, prevents oxygen in the air from reaching the hot filament. Without this glass covering and the vacuum it helps create, the filament would overheat and oxidize in a matter or moments.

Explanation:

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Answer 2

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It increases bulb life by preventing the tungsten filaments from deteriorating too quickly. Other gases such as helium, neon, nitrogen and krypton are also used in lighting. so to store this gases in bulb a glass coatings are used. Also the glass is non reactive with glasses,hence the glass are used to electric bulb.