Info

A ringing alarm driven with DC voltage is suspended inside a bell jar. The sound fades away as the air is pumped out and returns when vented. The arm of the ringer can still be seen moving up close.

NOTE: do not apply too much voltage (smoke/fire) or in the wrong direction!

Parts List

Vacuum Jar with Bell Inside by backwall

Vacuum Pump by backwall

DC power supply by backwall

Relevant Simulation

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Other Information

Demonstrating How Sound Can't Travel Through a Vacuum

Real-Life Examples

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More Advanced Reading

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