Demonstration Device of an Alarm from a Clock Under a Bell
Product Code : SCL-PLE-12384
The JaincoLab bell in a vacuum apparatus (SKU SCL-PLE-12384) demonstrates that sound needs a medium to travel. An electric bell rings inside a glass bell jar, powered through a rubber plug with two sockets; as the vacuum pump removes the air, the sound fades although the bell can still be seen working. Letting air back in brings the sound back. It is a standard demonstration in school sound lessons.
Specifications
The product data lists the items below. Bell jar size, pump type and supply voltage are not stated and are confirmed on the quotation.
| Product | Demonstration Device of an Alarm from a Clock Under a Bell |
| SKU / Product code | SCL-PLE-12384 |
| Enclosure | Glass bell jar |
| Sound source | Electric bell |
| Connections | Rubber plug with two sockets; glass tube; black and red connecting wires, 1 m each |
| Power | Electric power source |
| Evacuation | Vacuum pump |
Applications of the bell in a vacuum apparatus
Hearing the bell fade while still seeing it ring makes the idea of a sound medium convincing. The apparatus is used for:
- Showing that sound cannot travel through a vacuum
- Comparing how light and sound travel
- Introducing air pressure and vacuum pumps
- Sound lessons in middle and secondary school
Scope of supply and ordering
This listing covers the bell in a vacuum demonstration device, SKU SCL-PLE-12384, with bell jar, bell, plug, tube, power source, leads and vacuum pump. Accessories, spares and quantities are confirmed on the quotation.
MOQ, lead time and packing are confirmed on each quotation for the quantity and delivery destination; the glass bell jar is packed for transit. Sets are supplied singly or in bulk for schools and tender orders.
Frequently asked questions
What does the demonstration show?
That sound needs a medium: the bell becomes quieter as air is pumped out of the jar.
Is a vacuum pump included?
Yes. A vacuum pump is listed with the bell jar, bell and power source.
How is the bell powered inside the jar?
Through a rubber plug with two sockets, connected with the red and black leads.
Related products
Related apparatus:
See the full Physics Lab Equipments category or our physics lab equipment manufacturer in India hub.
Request a quote
For bell in a vacuum apparatus prices, contact us through the JaincoLab contact page. For tender or project supply, see our tenders page.
