fluid_mechanics.gif (14060 bytes)

MERCURY BAROMETER

(This demonstration is no longer used because it requires unconfined Hg.)





EQUIPMENT
    redball.gif (326 bytes) Toricelli Tube
    redball.gif (326 bytes) Tall Bell Jar
    redball.gif (326 bytes) Vacuum Pump
  


NARRATIVE
            A Toricelli Tube is placed under a tall bell jar which can be placed on the table of the  vacuum pump.  As the bell jar is evacuated, the air pressure on the reservoir decreases causing the mercury level in the tube to fall.