Thermal conductivity of bad conductor by lee's disc method viva
Answers
Thermal conductivity is the ability of a material to conduct heat.
Lee's disc is an apparatus discovered by the scientist Lee in 1898, to measure the thermal conductivity of poor conductors.
Apparatus
The apparatus consists of two metal discs, a steam chamber with an inlet and out tubes, two thermometers and the bad conductor sample.
Procedure
1. The bad conductor is placed in between the two metal discs and the steam chamber is placed above this. Finally, it is suspended in air.
2. Steam from hot water enters the steam chamber through the inlet and goes out. The metal discs are heated.
3. Heat is transferred from the top disc to the bad conductor and then to the bottom disc.
4. When the temperature of the two discs is steady, the temperature of the heat radiated is equal to the heat conducted by the conductor.