Bell Jar

Product Code: SE-7725


Demonstrate that sound requires a medium to propagate with this bell jar.

This thick glass bell jar with base plate includes an electric bell on a rubber mount to demonstrate that sound does not propogate in a vacuum. Remove the air from the jar and the sound from the bell gradually fades.


  • Glass bell jar
  • Vacuum base plate
  • Gasket
  • Hose
  • Battery-operated electric bell (removable)


Vacuum Pressure for Bell Jar
  • ≤ -0.06 MPa
Bell Voltage
  • 3 V DC
Bell Jar
  • 6.5″ diameter x 9.75″ tall
  • Inside diameter of 6.25″ x 8″ tall
  • 8″ diameter x 1.5″ tall