Less weight, imagine how much that would weigh if it was solid.
convert the tubes dimensions into linear measurement's using Pi and then the volumetric calculations become much more obvious. Mike Webster.
Basically they drive and sink hollow metal tubes into the river bed and after preparatory work fill them with whatever they are making the pillars out of.
It used 5200 vacuum tubes.
As most plastics used in specimen tubes will melt if sterilized with heat the plastic tubes are normally single use
Illinois makes steel pipe and tubes
Hollow tubes is an redundant expression. Tubes must be hollow, by definition. However tubes can be filled with something so they are not "empty" (they still will be hollow).
For the same amount of metal, hollow tubes are much stronger than solid tubes.
Stalagmites
A capillary is hollow. It is the smallest of the blood vessels, the tubes that carry blood.
Microtubules consists of hollow tubes which provide support of the cell.
IPS tubes are bus tubes where the current is carried through AL / Cu tubes (Hollow inside) and ACSR conductor are conductors basically with no any hollow part inside. Bus tubes given hollow portion inside taking in consideration greater skin effect to the current they carry -Anand Girgaonkar
microtubules
cytoskeleton
Xylem are just made up from cell walls left from cells, making hollow tubes. The walls of these tubes are hydrophilic, so water attaches readily to them, helping it to climb on its way up the plant.
astral ray
Cilia.
microtubules