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The buzzer in a vacuum demonstration kit allows you to show the concept of whether sound waves travel in a vacuum. The buzzer operates on a DC power source. The kit requires ¼" tubing and a vacuum pump, which are available separately.

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Students are always perplexed when asked, “Do sound waves travel in a vacuum?” Demonstrate this concept with the Buzzer in a Vacuum device. The buzzer operates on a DC power source. Turn the power on, and it buzzes loudly. Connect a vacuum pump to the jar assembly and turn on the pump. As air is pumped out of the jar, the sound of the buzzer becomes fainter. When all the air is removed, you can barely hear the sound. Slowly allow air to re-enter the jar, and the sound of the buzzer becomes stronger. Requires ¼" tubing. Vacuum pump available separately.