Barometer Siphon Tube

To demonstrate that when a liquid flows through a tube having a constriction, the speed of flow is increased and pressure decreased in the constricted section..

A horizontal tube 500 mm long 12mm O.D. is constricted near its centre and short side tubes are provided in each section for attaching glass manometer tubes 270 x 8 mm bore. If a constant head device is used to send a flow of water through the horizontal tube the variation of pressure in various sections may be determined.

This apparatus is used to compare the densities of liquids. It comprises of three limbed glass tube side limbs 45 cms long and rubber tubing on the centre limb closed by mohr clip.

Mounted on wooden stand with a 45 cm long scale on both limbs with zero at bottom. The densities of liquid are compared by measuring heights of the two columns of the liquid by applying suction to centre limb.