Everyday SciencePhysics
After long periods of use, a grey spot develops on the inside of a bulb. This is because
The tungsten filament evaporates and collects there
The heat of the bulb scorches the glass at the top
Dust inside the bulb condenses on the top
Glass undergoes a change due to the heat
The tungsten filament evaporates and collects there
At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert gas atoms collide with the evaporating tungsten, causing some of the tungsten atoms to return to the filament.
The tungsten filament evaporates and collects there At high operating temperatures, tungsten evaporates from the filament and gradually forms a gray film on the inside of the bulb. The inert gas atoms collide with the evaporating tungsten, causing some of the tungsten atoms to return to the filament.
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