Bell In Glass Jar and Base Manufacturer,Supplier and Exporter in India

Bell In Glass Jar and Base (Product Code: SLE/PHY/137) is a vacuum demonstration unit used to show that sound cannot travel through a vacuum, along with other properties of a vacuum, in school and college physics labs. It combines a sturdy baseplate with a tap, a glass bell jar and a detachable battery-operated bell, and works with a hand pump or, ideally, an electric vacuum pump. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Key Details

What Is the Bell in Jar Apparatus Used For?

In the classic experiment the bell is switched on, the jar is placed over it on the base, and the class hears it ringing clearly. As the pump draws air out through the tap, the sound fades even though students can still see the hammer striking, which shows that sound needs a medium to travel. Opening the tap lets air back in and the ringing returns.

Schools often teach it together with a tuning fork set as a sound wave experiment kit for the secondary science chapter on sound. A thin film of vacuum grease on the jar rim helps it seal on the plate, and the glass should be checked for chips or cracks before every evacuation.

What to Specify When Ordering

• The number of Bell In Glass Jar and Base units required (one per demonstration bench is typical).
• Whether a hand vacuum pump or an electric vacuum pump should be quoted with it.
• Whether connecting tubing between the tap and the pump is needed.
• Whether batteries for the bell should be included in the quotation.

OEM Manufacturer

The Bell In Glass Jar and Base is an own-make product: Jain Scientific Equipments Private Limited, trading as ScienceLab, is the OEM and makes the unit at its own licensed factory at Saha, Ambala, Haryana, India. The company is incorporated under CIN U29309HR2020PTC087597, and its factory premises operate under Factory Licence AMB-ONLINE-CHD-J-414. Quotations, repeat orders and requests for a replacement jar or bell come straight to the manufacturer, so ask us about availability. More about the company is on the ScienceLab profile.

Related Physics Lab Equipment

These items complete a vacuum and air-pressure demonstration set:

• Vacuum Pump, Hand — manual pump for evacuating the bell jar.
• Vacuum Pump, Electric — the preferred pump type for this unit.
• Vacuum Tubing — connects the baseplate tap to the pump.
• Magdeburg Hemisphere — another air-pressure demonstration that uses the same pump.
• Tuning Fork Set, Steel — for the rest of the sound lesson.

Browse all Physics Lab Equipment for further sound and pressure apparatus.

Frequently Asked Questions

What does the Bell In Glass Jar and Base consist of?
The Bell In Glass Jar and Base comprises a sturdy baseplate with a tap, a glass bell jar and a detachable battery-operated bell. A vacuum pump is not among the listed parts, so it is chosen and ordered separately to suit your lab.

Which vacuum pump works with the Bell In Glass Jar and Base?
The Bell In Glass Jar and Base can be used with a hand pump or, ideally, with an electric vacuum pump connected to the baseplate tap. The tap lets you hold the reduced pressure or let air back in during the demonstration.

Why does the bell sound fainter as air is pumped out of the jar?
In the Bell In Glass Jar and Base, sound reaches the class as vibrations passed through air. As the pump removes air, fewer molecules are left to carry those vibrations, so the ringing fades while the hammer can still be seen moving.

Is the bell in the Bell In Glass Jar and Base removable?
Yes, the bell in the Bell In Glass Jar and Base is detachable and battery-operated, so it can be taken out for changing cells or for storage. Ask us whether cells are included when you request a quotation.

Who manufactures the Bell In Glass Jar and Base?
The Bell In Glass Jar and Base is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory at Saha, Ambala, Haryana, India. Schools, dealers and importers buy it direct from the maker.

How should the glass jar of the Bell In Glass Jar and Base be handled?
Before lifting the glass jar of the Bell In Glass Jar and Base, open the tap so air re-enters and the jar releases from the plate. Inspect the jar for chips or cracks before each use and store it with the rim protected.

What should a quotation request for the Bell In Glass Jar and Base include?
For the Bell In Glass Jar and Base, give the product code SLE/PHY/137, the number of units, the pump type you want quoted with it and your delivery address. Institutions and importers can add other vacuum apparatus to the same request.

Request a Quote

Send your requirement for the Bell In Glass Jar and Base through the contact page or add it to the enquiry cart. The quotation comes direct from the manufacturer.

Last updated: 24 September 2026