Thermal Conductivity.docx

OBJECTIVE  

Compute for the thermal conductivity of a material Determine the material of the rod used using its computed thermal conductivity

EQUIPMENT NEEDED USB Link (2x) PASPORT Temperature Sensors

Soldering iron metal rod

Buret clamps

PROCEDURE / EXPERIMENTAL SET-UP 1. Arrange the equipment as shown in the figure. 2. Measure the length and diameter of the rod. Compute for its cross sectional area. 2. Attached the USB links to the computer and open the Data Studio software. Choose “create experiment” and you should see a Temperature vs time graph. There should be two temperatures indicated in the graph (Temperature and Temperature 2). 3. Determine that the end with the soldering iron is Temperature 1 and the free end is Temperature 2 by clicking on the start tab of data studio and pressing and removing the connection of one temperature sensor from the USB link. This sensor will give a negative temperature reading. 4. Clear all the graphs of data from Data Studio from deleting all data runs. 5. Start data studio and get the initial temperature of the two ends of the rods. Turn on the soldering iron and watch the graphical display to observe the temperature change. After 15 minutes click on the stop tab to stop the recording of data. 6. Get the final temperature of the ends of the rods. 7. Get the slope of each of the two graphs. This corresponds to the heat current due to conduction in the material. Get the average of the two values. 8. Compute for the thermal conductivity of the rod, using the following formula:

What is the material of the rod?