It can be a single word "pipefitting" (done by pipefitters and plumbers). It also appears in the two-word form in some sources.
NO but copper tubing will fit inside one another BUT not schedule 40 or thicker
If I remember correctly, the pipe size is the inside diameter, so it would depend on the thickness of the wall, as to what size it would fit into.
No
Cut, bevel, grove, thread and otherwise fit pipe and fittings together according to plans.
yes
Please Calculate the weight per fit of G.I. pipe
Three 0.50 inch diameter pipes will fit into one 1.50 inch diameter pipe (hypothetically). The 0.50 inch diameters stack on top of each other until you have 1.50 inches!
The dryer vent hose may not fit over the wall vent pipe due to differences in size or shape, causing a mismatch. It is important to ensure that both the hose and pipe are compatible to prevent any issues with ventilation.
It should, are you sure your pvc pipe is round
no due to the bend in the link pipe
Fit a length of pipe over it to make it longer.
yes they are all the same