Our quality bell jar demo is a great tool to discover how sound requires a medium to travel, and other experiments. Includes a glass bell jar, vacuum base plate, gasket, hose, and battery-operated ringer electric bell. Glass Bell Jar dimensions: 6.5" diameter, 9-3/4" tall (inside dia 6"-1/4, inside height 8"). Base dimensions: 8" diameter, 1-1/2" height. Requires 2 AA batteries and a vacuum pump.
