Yes, your mailbox can be put on something sturdy. My dad put ours on a wagon wheel set in cement. Someone tried to steal it once, but it was chained in the cement and wouldn't move. I think a car could have hit it and it would have stood up. Decorate your pipe so it looks nice or a bit different.
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Yes, a sewage drain pipe can be too large.
A large pipe, which is used to carry off water or sewage.
yup
Pressure rises at the junction.
China is a large country to export steel pipe, if you want to buy steel pipe, you can import from China.
The pressure increases as the volume decreases, so when the pipe is changed from large to small, the pressure of the gas will increase.
Pressure gauges. In a home or car AC there is small pipe and a large pipe going to the compressor unit outside or in the engine compartment. The large pipe should be cold and "sweating" ( dripping water).
A pipe bending machine is used in a factory to shape large pieces of metal for use in constructing things. This is a good way to get parts made for large projects.
If you are talking about the large copper pipe, you wrap it in insulation. You can get it at Home Depot or Lowes.
you have a severe pressure drop and a loss of velocity
A pipe organ is a large musical instrument that is usually found in large churches or cathedrals. The musician sits on a bench and plays on usually a choice of anywhere from three to six different keyboards. The sound on a pipe organ is created by air vibrations controlled by the musician from these keyboards. The pipe organ has been around much longer than the piano!