Stefan Boltzmann Apparatus Manufacturer,Supplier and Exporter in India
Product Code : EL-SBA-7378
Jlab Export is a leading Stefan Boltzmann Apparatus Manufacturer,and suppliers in India
Stefan Boltzmann Apparatus (code EL-SBA-7378) is a radiation set-up for determining the Stefan-Boltzmann constant from the rate at which a copper test disc warms up inside a hot hemisphere. The hemisphere is fixed to a Bakelite plate and heated through its outer jacket by hot water from a tank mounted above it. JLab manufactures the hemisphere, tank and disc assembly in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Hemisphere | Fixed to a Bakelite plate; its outer surface forms the heating jacket |
| Heating medium | Hot water from a tank fixed above the hemisphere |
| Test disc | Copper, introduced at the centre of the hemisphere |
| Temperature measurement | Sensors for the hemisphere and the test disc |
| Quality check | Each apparatus is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 14–18 working days |
| Product code | EL-SBA-7378 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
Working Out σ From the Disc Readings
Hot water from the tank heats the jacket until the hemisphere temperature Th is steady. The copper disc, still at room temperature Td, is then introduced at the centre and its temperature is noted at regular intervals. At first the disc gains heat almost entirely by radiation from the hemisphere, so m c (dT/dt) = σ A (Th⁴ − Td⁴), where m, c and A are the mass, specific heat and exposed area of the disc and its surface is taken as black. The slope of the temperature–time curve at the moment of insertion then gives σ = m c (dT/dt) / [A (Th⁴ − Td⁴)], with all temperatures in kelvin. The textbook value is about 5.67 × 10⁻⁸ W/m²K⁴.
Effect of Hemisphere Temperature
The second experiment repeats the test with the hemisphere held at other temperatures. Since σ is a physical constant, the results should stay close to one another, and any trend with Th shows how heat gains other than radiation affect the measurement.
Other Set-ups Involving Thermal Radiation
- Emissivity Measurement Apparatus — compares a test plate with a blackened plate at equal temperature.
- Combined Convection and Radiation — studies convection with radiation from a heated horizontal cylinder.
JLab groups it under Stefan Boltzmann Apparatus in the Heat Transfer Lab Equipment range.
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Last updated: 30 October 2026