Pipe (fluid conveyance) - Wikipedia
https://en.m.wikipedia.org/wiki/Pipe_%28fluid_conveyance%29
WebA pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases ( fluids ), slurries, powders and masses of small solids. It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members.
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