Can vacuum tubes contain a gas?

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Vacuum tubes, including triodes like the type 884 tube, can contain gas, such as argon. The terminology can be confusing, as vacuum tubes are typically associated with a vacuum environment, but some are designed to operate with a gas. The type 884 tube is a gas-filled triode, which distinguishes it from traditional vacuum tubes. Understanding the specific function and design of the tube clarifies its classification. This distinction is important for accurate communication in electronics.
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Homework Statement



I was doing an experiment containing gas or vacuum tubes "type 884 tube". It contains argon gas but when reading about triodes and cathode ray tubes, they are generally referred to as vacuum tubes - the type 884 tube is a triode, so does that mean it is a gas filled triode? or is it a vacuum tube containing a gas?

This is mostly just a terminology question - if this isn't allowed, I apologize but I just thought that asking you would be the best way to get an informative answer. Also, I realize this seems quite silly but it has been irritating me.
 
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Thank you for your input, it was very helpful.
 
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