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Bell jar with battery operated buzzer

Stock Code:
PH0178
Unit:
Each
Price:
$79.00 (ex GST)

Description

Without air or matter, sound waves cannot travel and therefore cannot be heard. This bell jar effectively demonstrates this concept using a battery–operated buzzer housed inside an acrylic tube. When the buzzer is placed beneath the jar and a vacuum seal is created in the chamber, students will observe a total absence of sound. Once air is returned to the chamber, the sound of the buzzer can be heard once more. Activity requires a vacuum pump, not included. Height 14 cm dia. 10 cm.

In Stock