Bell and Vacuum Sound Jar Plastic

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 D batteries (not included), Vacuum Pump Plate.

Assembled unit is 7.5 in. (190 mm) x 11 in. (280 mm) Diameter x Height.

Perfect for isolating experiments from outside interference or studying the Properties of Matter in a Vacuum. This Bell jar is for use in only Physics Experiments to teach Science. It can withstand small amounts of Vacuum. How much Vacuum, we do not know. We are not liable for any other use.

Strong plastic construction. Acrylic Bell jar. This is a molded bell jar and does have some scratched or rub marks which happen in course of handling and manufacturing and are normal. They are absolutely new and un-used. We do not consider these to be a cause for return or replacing the product.

Measurements are approximate.