Noun
U-tube (plural U-tubes)
(sciences, engineering) A tube in the shape of a capital U, in certain applications having a semipermeable membrane in the middle.
In modern laboratories precise measurements of relative density are made using oscillating U-tube meters. Source: Internet
The pitot tube can be inserted through a small hole in the duct with the pitot connected to a U-tube water gauge or some other differential pressure gauge for determining the flow velocity inside the ducted wind tunnel. Source: Internet
Typically, a U-tube manometer is used, which directly shows the pressure difference between the container and the atmosphere. Source: Internet
To further minimize mixing of the electrolytes, a salt bridge can be used which consists of an electrolyte saturated gel in an inverted U-tube. Source: Internet