Description

The Venturi tube is found in everything from
carburators to aircraft airspeed indicators. This
demonstration version is made of glass and has
three side tubes for attaching an included threeleg
manometer.
The manometer is filled with colored water to
show the relative pressures at significant points of
the tube when gas is flowing through it.
By blowing through the tube, a sufficient gas flow
can produce clear differences of water level in the
three manometer legs. The tube is 22 cm long, 2.0
cm in diameter at the wide ends, and narrows to
10 cm in diameter in the middle.