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Bell Experiment Apparatus Manufacturer,Supplier and Exporter in India

Product Code : ILS-PLE-10149

Indian Lab Suppliers supplies the Bell Experiment Apparatus (Product ID: 10149) as part of its physics lab equipment range. It shows that sound needs a material medium, using an electric bell hung inside a bell jar that is then evacuated.

Quick Answer

An electric bell hangs from binding posts and connectors in the rubber stopper of a 2 litre bell jar. It runs on 3 to 6 V from a battery or a transformer. As air is pumped out, the ringing grows fainter even though the hammer can still be seen striking, because there is less air to carry the sound; a faint sound usually remains, since no school pump gives a perfect vacuum and some sound travels through the supports. Check the glass for cracks before evacuating.

Key Specifications

Parameter	Detail
Bell jar	2 litre, glass
Stopper	Rubber, with binding posts and connectors
Bell	Electric, suspended inside the jar
Supply	3–6 V, battery or transformer

Where This Is Used

Used in sound lessons with an Air Pump (Vacuum Pump with Aluminium Plate) (Product ID: 10148); a larger Bell Jar (Product ID: 10230) is also available. Browse the full Physics Lab Equipment range or related Sound and Resonance products.

Frequently Asked Questions

What does it demonstrate?
That sound cannot travel through a vacuum.

What voltage does the bell need?
3 to 6 V, from a battery or a transformer.

Why is some sound still heard?
A school pump leaves some air, and sound also travels through the bell’s supports.

Related Categories

Physics Lab Equipment · Sound and Resonance · Physics Lab Equipment

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