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Bell Jar, Knobbed
Bell Jar, Knobbed (Product Code: SCL-665/080) is a bell-shaped glass cover used to contain a vacuum, made from neutral glass with a ground flange at the rim and a knob at the top for lifting. At 100 mm in diameter and 200 mm high it is sized for compact bench demonstrations, and the thin glass is made with extra care for optical clarity, so students can see clearly what happens inside as the air is removed. Teachers of chemistry and physics use it to show the effects of reduced pressure, and it sits comfortably within a school's chemistry lab glassware. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Product Code | SCL-665/080 |
| Material | Neutral glass, thin-walled |
| Rim | Ground flange |
| Top | Knob for lifting |
| Diameter | 100 mm |
| Height | 200 mm |
| Shape | Bell-shaped |
| Properties | Transparent, made with care for optical clarity, heat resistant |
| Purpose | Containing a vacuum in laboratory demonstrations |
Typical Use
Stand the jar on a flat, smooth plate connected to a vacuum pump and draw the air out to show classic reduced-pressure effects: a partly inflated balloon swelling as the pressure around it falls, warm water beginning to boil without further heating, or a small battery buzzer growing faint as there is less air to carry its sound. Because the glass is clear, a whole class can watch from the bench. Outside vacuum work, the same jar can serve as a clear dust cover over small apparatus or as an enclosure for a potted seedling in a simple transpiration set-up.
For a good seal, spread a thin, even film of petroleum jelly or vacuum grease on the ground flange before placing the jar. Inspect the glass for chips and scratches before every evacuation, work behind a safety screen and let air back in slowly before lifting the jar by its knob. Clean it with mild detergent and a soft cloth to protect the clarity of the glass. It is a practical addition for any school buying from a lab glassware manufacturer in India that wants demonstration pieces as well as everyday vessels.
Manufacturer
ScienceLab is the brand of Jain Scientific Equipments Private Limited, a company based in Ambala, Haryana, that manufactures laboratory apparatus and glassware for teaching and research institutions in India and international markets. See the ScienceLab company profile for more about the business.
Related Laboratory Equipment
To run vacuum demonstrations with this jar, buyers usually add:
- Vacuum Pump, Hand — a manual way to draw air out for classroom demonstrations.
- Vacuum Pump with Pressure Gauge — shows students how far the pressure has dropped.
- Petroleum Jelly White — a thin film on the ground flange improves the seal.
- Bell In Glass Jar and Base — a ready-made set for the sound-in-vacuum experiment.
- Bell Jar (Plant Physiology) — a bell jar from the Biology Lab range for enclosing plants.
More glassware is listed in the Chemistry Lab category.
Frequently Asked Questions
What size is the bell jar?
It is 100 mm in diameter and 200 mm high, with a ground flange at the base and a knob at the top.
Does it come with a vacuum plate or pump?
This listing is for the knobbed bell jar. Pumps are listed separately; if you need a plate or a complete set, ask through the contact page and we will advise.
How do I get an airtight seal?
Place the ground flange on a flat, clean plate and apply a thin layer of petroleum jelly or vacuum grease to the flange before evacuating.
Can the jar be heated?
The glass is heat resistant, but a bell jar is a cover for vacuum and enclosure work, not a heating vessel. Keep it away from direct flame and sudden temperature changes.
What safety steps apply under vacuum?
Check for chips or cracks first, use a safety screen during evacuation and release the vacuum slowly before lifting the jar.
Is a calibration or test certificate supplied?
A bell jar is not a measuring instrument. If your purchase process needs any documentation, please discuss it with us before ordering.
Can you supply several jars or ship overseas?
Yes. We supply schools, colleges and dealers in India and international markets; share quantity and destination for a quotation.
Request a Quote
Tell us how many bell jars you need, and whether pumps should be quoted with them, through the contact page. You can also add Bell Jar, Knobbed (SCL-665/080) to the enquiry cart with the rest of your list.
Last updated: 24 September 2026
