Stefan Boltzman Apparatus

The apparatus is designed to determine the Stefan Boltzman constant. The apparatus consists of a hemisphere fixed on a backlite plate, the outer surface is surrounded by a hot water jacket. Hot water to heat the tank is obtained from a hot water tank with heater fixed above hemisphere. Hot water jacket heats the hemisphere and this heat is transferred to a small copper test disc by radiation. This small test disc can be introduced at the center of hemisphere. A thermocouple is provided at the canter of disc to measure the temperature of disc. With the help of Timer/Stop Clock change in temperature with respect to time can be recorded. The average temperature of hemisphere can be measured by four thermocouples placed on hemisphere.

Features:
Easy understanding of phenomenon of heat transfer by radiation.
Determination of Stefan Boltzman constant.
Built in timer for temperature measurement at constant intervals.

Specifications:

• Hemisphere made of copper, 200 mm dia, approx.
• Hot water jacket.
• Test Disc - 20 mm dia., 1.5 mm thick, copper
• Hot water tank with heater.

Instrumentation & Controls :

• Multy channel Digital Temperature Indicator.

Experimentation :

1. Determination of Stefan Boltzman Constant.
2. Study of effect of hemisphere temperature on the constant.

Service Required :

• 230 V.A.C. stabilized supply with earthing.
• Floor space - 1.5 m X 1.5m at working height.