Vacuum bell with hand pump

Vacuum bell with hand pump – Educational demonstration tool for classroom physics

An economical version of the classic demonstration showing that sound waves do not propagate in a vacuum. The set includes a transparent bell jar with a bell (powered by 4–6 V AC/DC, flat battery or included power supply) placed on a rubber‑sealed base with a built‑in hand pump that allows significant rarefaction of the air inside the jar and reduction of the bell’s loudness. The use of a hand pump makes the set affordable and, although it does not create a full vacuum, it clearly demonstrates the difference in sound intensity. This makes the experiment easy to conduct during lessons while maintaining high demonstration value.

Ready to use immediately after purchase – the set includes a power supply, so there is no need to buy additional components. It is a convenient solution for teachers conducting experiments in acoustics and mechanical waves.

Specification:

• demonstration of the effect of vacuum on the propagation of sound waves
• hand pump for rarefying gases under the bell jar
• transparent bell jar for observing the experiment
• bell powered by 4–6 V AC/DC
• power supply included
• stable base with built‑in hand pump
• set ready to use after purchase

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The product is also available as a set with an electric pump. See:
Vacuum Bell Set with Manual and Electric Pump, Vacuum Gauge, Bell and Digital Sound Level Meter