One or two bars?

[reohn2]

sheldon, as always, has an answer

would you not smack your face on the bar when tucking down???

Pehaps its a tandem where the stoker sits on the captains shoulders

[Jeckyll_n_Snyde]

can you not think of a pair of things, one bigger and lower than the other>?

Dentures

[pigman]

Pipes are folded-over flat sheet.
Tubes are drawn.

twaddle

pipes are specified in their internal diameter size
tubes in their OD, maybe with a reference to wall thickness

mick
twice this week youve been twaddled. wots happening?

[Mick F]

I must be dwunk, or twist.

Sowwy!

[Mick F]

Pipe or Tube?

Wiki says:

Tubing is a pipe or hollow cylinder for the conveyance of fluids (liquids or gases). The terms 'pipe' and 'tubing' are almost interchangeable, although minor distinctions exist (generally, "tubing" implies tighter engineering requirements than "pipe"). Both "pipe" and "tube" imply a level of rigidity and permanence, whereas a "hose" is usually portable and flexible. Tubing and pipe may be specified by standard pipe size designations, e.g. Nominal Pipe Size — or by nominal outside or inside diameter and/or wall thickness. The actual dimensions of pipe are usually not the nominal dimensions (i.e., a "1-inch" pipe will not actually measure 1" in either outside or inside diameter) — whereas many types of tubing are specified by actual I.D., O.D., and/or wall thickness. There are many industry and government standards for pipe and tubing.

My Concise OED doesn't give much in the way of definition, but the above from Wiki seems to say that "tubing" can be specified in either OD or ID.

[mrsbloomsburybarton]

Doh! I meant to say it was a tube, rather than a bar! ie handle tube, not handle bar, like we say top tube not cross bar!!