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. It serves gas-law practicals in Class 11–12, B.Sc. and diploma physics labs. Science Lab Supplies manufactures it at its factory at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and supplies it direct to schools, colleges and distributors.
Specifications
The table sets out each specification of the combined Jolly's model. In short, it is a Jolly's air bulb joined by rubber tubing to a glass mercury reservoir that slides along a vertical rod, mounted on a polished wooden stand with a cast metal base and a 0–100 cm metre rule.
| Specification | Value |
|---|---|
| SKU | LSK-POM-11200 |
| Also known as | Jolly's apparatus |
| Gas vessel | Jolly's air bulb |
| Reservoir | Glass mercury reservoir |
| Connection | Flexible rubber tubing between air bulb and reservoir |
| Reservoir mounting | Sliding bracket on a vertical rod, set anywhere along its length |
| Stand | Polished wooden stand |
| Base | Heavy cast metal base with levelling screw |
| Scale | Metre rule fixed on the stand |
| Scale range | 0–100 cm |
| Graduation | 1 mm |
| Scale reading | Numbered in both directions |
| Mercury | Not included (supplied without mercury) |
| 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 NCERT Class 11 gas-law topics, B.Sc. heat 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, with the bulb heated in a Water Bath, 7 L and the temperature read on a Glass Thermometer.
- B.Sc. practical: determining the pressure coefficient of air with Jolly's apparatus.
- Extending the pressure–temperature graph towards absolute zero for the Kelvin scale, then contrasting it with constant-temperature behaviour on the syringe-type Boyle's Law Apparatus.
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 that quantity. 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). To price a set for your gas-law bench, write in through the contact page, add it to the enquiry cart, or follow the lab tender page for formal bids.
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 or the lab tender route, and Science Lab Supplies will return an item-wise quotation matched to the specification above.
Related Gas-Law and Heat Apparatus
These Properties of Matter and Heat items cover the pressure, volume, kinetic-theory and expansion practicals that sit alongside a constant-volume gas experiment, and any of them can go on the same quotation.
- Charles Law Apparatus, Basic — U-shaped glass tube with a graduated limb, held in a 1000 ml tall beaker with stirrer.
- Boyles Law Apparatus, Advanced with Oil — oil chamber with Bourdon gauge and a glass tube read against a 0–65 cm³ scale.
- Bourdon Gauge — dual-scale dial reading 0–50 lb/in² and 0–3.5 kg/cm², on a cast metal base.
- Kinetic Theory Apparatus — motor-driven piston agitates small metal spheres on a diaphragm to model gas molecules.
- Expansion of Liquid Apparatus — five graduated capillary tubes with bulbs, set in a hot-water trough.
- Linear Expansion Apparatus — metal rod in a steam jacket with an expansion indicator; steam source not included.
- Joule's Calorimeter — 5 x 7.5 cm copper calorimeter in a polished wooden outer vessel, with heating-coil terminals.
Browse the Properties of Matter range, the Heat range or all physics lab equipment.
Last updated: 9 October 2026