Searle's Thermal Conductivity Apparatus
Product Code : LSK-H-11157
Searle's Thermal Conductivity Apparatus (SKU LSK-H-11157) measures the thermal conductivity of a good conductor by passing heat along a copper rod from a steam-heated end to a water-cooled end. It is set up in B.Sc. heat practicals, B.Tech engineering physics labs and polytechnic heat-transfer classes. Science Lab Supplies manufactures the apparatus in its Saha works at Plot 448, HSIIDC Industrial Area, Ambala, India, and sells it without intermediaries to colleges, laboratory contractors and distributors.
Specifications
Rod sizes, heating arrangement and case details of the Searle's apparatus appear row by row below. In brief, a 30 cm copper bar sits in a felt-lined wooden case with a removable front; one end is enclosed in a steam jacket fed from a boiler, while a spiral water tube cools the other end.
| Specification | Value |
|---|---|
| SKU | LSK-H-11157 |
| Conducting bar | Cylindrical copper rod |
| Rod size option 1 | 30 cm long x 1.8 cm diameter |
| Rod size option 2 | 30 cm long x 2.5 cm diameter |
| Rod size option 3 | 30 cm long x 3.7 cm diameter |
| Hot end | Steam jacket around one end, heated from a boiler |
| Cold end | Spiral tube carrying a stream of cooling water |
| Housing | Wooden case lined with felt |
| Case front | Removable front portion |
| Thermometers | Not included |
| Steam boiler | Not included |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Searle's Apparatus
The apparatus is used to find the coefficient of thermal conductivity of copper by Searle's method: once a steady state is reached, the temperature fall along the rod and the heat carried away by the cooling water give the conductivity. It is a standard piece of heat and thermodynamics lab equipment for degree courses.
- B.Sc. physics practical: determining the thermal conductivity of copper, reading rod temperatures on alcohol-type Laboratory Thermometers (-10 to 100 °C).
- B.Tech and diploma heat-transfer labs: steady-state conduction and the temperature gradient along a metal bar.
- Holding the cooling-water flow steady with a Constant Level Tank, so the outlet temperature settles before readings.
- Checking inlet and outlet water temperatures with a non-mercury Glass Thermometer marked in 1 °C steps.
Start the cooling water before admitting steam, and handle hot steam connections only under teacher supervision.
Standard Scope of Supply
Each apparatus comprises the copper rod with its steam jacket at one end and the spiral cooling tube at the other, housed in the felt-lined wooden case with a removable front. The rod diameter you choose (1.8, 2.5 or 3.7 cm) is stated on the quotation. Thermometers and the steam boiler are not included.
Packing, MOQ and Lead Time
A quotation can cover one apparatus for a demonstration bench or several for a full undergraduate heat lab, and it lists the packing, delivery time and price for the quantity you specify. Thermometers, a constant level tank and other heat apparatus can be priced on the same quotation.
With an Importer-Exporter Code on record, Science Lab Supplies is able to ship to buyers in Ethiopia, Tanzania, Uganda, the UAE, Saudi Arabia and Oman. To price this apparatus, send the rod size and quantity through the contact page, place it in the enquiry cart, or consult the lab tender page for institutional bids.
Frequently Asked Questions
Which rod sizes are available for Searle's apparatus?
The copper rod is 30 cm long in every version, with a choice of 1.8 cm, 2.5 cm or 3.7 cm diameter. State the diameter you need in your enquiry so that the quotation matches your practical manual.
Are thermometers and a steam boiler supplied?
No. The apparatus is supplied without thermometers and without a steam boiler. Your laboratory can use its own, or ask for suitable thermometers to be added to the same quotation.
How is the cold end of the rod cooled?
A spiral tube fitted at the cold end carries a stream of water. Heat conducted along the rod passes into this water, and its temperature rise and flow rate let students calculate the heat flowing through the copper each second.
Is Science Lab Supplies the manufacturer or a trader?
It makes the apparatus itself. Searle's apparatus is built and finished in the company's Saha, Ambala plant, so your enquiry is priced by the people who produce it rather than by a reseller or agent.
Related Heat Conduction and Expansion Apparatus
These items from the Heat range and the wider physics catalogue cover conduction in good and poor conductors, wax-melting comparisons of metals and thermal expansion, so they pair well with a steady-state copper rod experiment and can be listed on one quotation.
- Lee's And Charlton's Apparatus — brass slab 11 cm across and 10.5 mm thick for the relative conductivity of thin layers.
- Callendar and Barne's Apparatus (Continuous Flow) — borosilicate glass tube with a nichrome heating coil about 40 cm long.
- Conductometer, For Thermal Conductivity — five metal rods on a brass hub, compared by melting paraffin wax.
- Conductivity Ring — copper, brass, steel and aluminium strips on one ring with wax cups at the ends.
- Apparatus for Changing the Thermal Conductivity — three rods of different metals fitted with a movable metal ring.
- Linear Expansion Apparatus — rod in a steam chamber whose expansion shows on an end indicator.
Browse the full Heat range, the Physics Lab range for conductometers and calorimeters, or all physics lab equipment.
Last updated: 9 October 2026