Charles Law Apparatus (Combined)
Product Code : LSK-POM-11200
Charles Law Apparatus (Combined) (SKU LSK-POM-11200), also known as Jolly's apparatus, shows how the pressure of a fixed mass of air rises with temperature when its volume is held constant. Physics teachers use it for gas-law practicals in Class 11–12, B.Sc. heat and thermodynamics labs and diploma courses. Science Lab Supplies manufactures it at its factory at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and supplies it direct to schools, colleges, tender contractors and distributors.
Specifications
This combined model is a Jolly's air bulb joined by flexible rubber tubing to a glass mercury reservoir that slides along a vertical rod, all mounted on a polished wooden stand with a heavy cast metal base and a fixed metre rule graduated 0–100 cm in 1 mm divisions.
| Parameter | Value |
|---|---|
| SKU | LSK-POM-11200 |
| Also known as | Jolly's apparatus |
| Scale | Metre rule, 0–100 cm x 1 mm, reading in both directions |
| Mercury | Not included |
| Demonstrates | Pressure–temperature relationship of a fixed mass of gas at constant volume |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Charles Law Apparatus
The apparatus is used to verify that gas pressure rises in step with temperature at constant volume and to measure the pressure coefficient of air. It fits the gas-law topics of NCERT Class 11 physics, B.Sc. heat and thermodynamics practicals, and physics labs in polytechnics and engineering colleges.
- Class 11–12 physics: showing that pressure is proportional to absolute temperature for a fixed volume of air.
- B.Sc. practical: determining the pressure coefficient of air with Jolly's apparatus.
- Extending the pressure–temperature graph back towards absolute zero to introduce the Kelvin scale.
At each water-bath temperature the reservoir is moved until the mercury returns to a fixed mark, so the air volume stays constant and the scale reading gives the pressure. The specification calls this Charles's law; many syllabuses name it the pressure law or Gay-Lussac's law.
Standard Scope of Supply
Each set comprises the Jolly's air bulb, a glass mercury reservoir on a sliding bracket, rubber connecting tubing, the support rod, the wooden stand on a cast metal base with levelling screw, and the 0–100 cm metre rule. Mercury, a water bath and a thermometer are not included.
Packing, MOQ and Lead Time
You can request a quotation for a single set or for a full laboratory quantity, and each quotation from Science Lab Supplies states the packing, delivery time and price for the quantity you ask for. A thermometer or water bath can be added to the same quotation.
As a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Kenya, Ethiopia, Nigeria, Oman, Nepal and the Philippines. The business is registered under Udyam as a manufacturing enterprise (UDYAM-HR-01-0014546) and for GST (GSTIN 06ADEPJ0574F2ZU). Enquire via the contact page or enquiry cart; see also the lab tender page.
Frequently Asked Questions
Is mercury supplied with the Charles Law Apparatus (Combined)?
No. The set is supplied without mercury, so the laboratory fills the reservoir itself. Handle mercury only under teacher supervision and your institution's safety rules.
What experiment is Jolly's apparatus used for?
Jolly's apparatus is used to study how the pressure of a fixed mass of air changes with temperature at constant volume, and in B.Sc. labs to find the pressure coefficient of air.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer. The apparatus is made at its own factory in Saha, Ambala, India, and quotations come directly from the factory.
Can this apparatus be quoted for a school or college tender?
Yes. Send the quantity, delivery location and tender specification through the contact page for an item-wise quotation with the specification above.
Related Physics Lab Equipment
Four items from the Properties of Matter range complete a gas-laws bench alongside Jolly's apparatus: they cover the Boyle's law, pressure-measurement and kinetic-theory practicals that usually follow the constant-volume experiment in school and college physics courses, and all four can go on the same quotation.
- Charles Law Apparatus, Basic — U-tube version for introductory classes.
- Boyles Law Apparatus, Advanced with Oil — pressure–volume relationship at constant temperature.
- Bourdon Gauge — dial gauge for teaching pressure measurement.
- Kinetic Theory Apparatus — models the molecular motion behind gas pressure.
Browse the full Properties of Matter range or all physics lab equipment.
Last updated: 25 September 2026