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CognitiveNet
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How can a plasma globe or a light bulb made of glass be sealed after the air has been removed by a vacuum pump?
CognitiveNet said:Is it sealed before or after the air is pumped out?
CognitiveNet said:Is it sealed before or after the air is pumped out?
Bulbs and globes are vacuumed using specialized equipment that removes all the air and gases from inside the bulb or globe. This creates a vacuum, which is necessary for the proper functioning of the bulb or globe.
Bulbs and globes are vacuumed to prevent the filament or electrodes from burning out quickly. Without a vacuum, the filament or electrodes would quickly oxidize and burn, rendering the bulb or globe useless.
Once the vacuum is created, the opening of the bulb or globe is sealed using electrodes or a glass stem. This ensures that no air or gases can enter the bulb or globe, maintaining the vacuum inside.
Bulbs and globes are sealed to maintain the vacuum inside and prevent any outside elements from entering, which could damage the filament or electrodes and affect the performance of the bulb or globe.
Bulbs and globes are tested for vacuum and seal using specialized equipment that measures the pressure inside the bulb or globe. If the pressure is not at the desired level, the bulb or globe is rejected and not used for production.