They seem the same.
In: Engineering
Pipes generally have threads on their ends, and you connect them using those threads. Tubes generally don’t have threads, and you connect them using compression. There are plastic pipes, that use glue to pretend to be threads, so that’s another case.
Tube is also used in cases there the effect isn’t to move a liquid. The round forms you put concrete in are tubes, because the concrete turns solid and holds something up. Similarly, tubes can be used to give more cross sectional area, to reduce flex, that a solid structural member of the same mass.
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