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Why is the cathode ray tube connected to a vacuum pump?

Why is the cathode ray tube connected to a vacuum pump?
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Why is the cathode ray tube connected to a vacuum pump?

User RickyAYoder
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The cathode ray tube is connected to a vacuum pump because the vacuum pump is used to draw air out of the ray tube before it closes/sealed. Hope this helps.
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User Matteo Cocon
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