what is vacuum tube?

what is vacuum tube?
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1 Answer

Answer :

A vacuum tube is a tube with no air particles.
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Impressed current cathodic protection is used on vessels instead of _________________. A. fire alarm systems B. repeated painting C. sacrificial zincs D. vacuum tube degaussing systems

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08. The vacuum pressure can be measured with the help of a Piezometer tube. A) True B) False

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