Bell and Vacuum Demonstrator
To demonstrate the principle that sound does not travel in vacuum.
This is a modified unit which does not require external power source for the bell.
Comes complete with Bell Jar, Bell which requires 2 AA batteries (not included), Vacuum Pump Plate and Vacuum Hose.
Assembled unit is 8.5 in. x 11.5 in.
Diameter x Height.
Specification