Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

# Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

 Choose a Topic or Enter a keyword to search: I cannot find what I want! You have selected the following Demos: None Selected

Choose a subtopic:
Thermal Properties Of Matter
Heat And The First Law
Calorimeter
Heat Capacity using Wax and metal Balls
video  - Convection Box
Convection Chimney
Chimney with Vane
video  - Heat Conduction
video  - Thermal Conductivity
video  - Light The Match
Leslie Cube
Boiling Water in a Paper Cup
Steam Gun
video  - Fire Syringe
Jug O' Air
Change Of State
Kinetic Theory
Gas Law
Entropy And The Second Law

### video  - Thermal Conductivity

#### Purpose:

To demonstrate thermal conduction along a metal rod.

#### Procedure:

Attach four steel balls to each of three different rods with modeling clay. The rods are made of COPPER (left), ALUMINUM (front right) and STAINLESS STEEL (back right) in the video above. Light the burner and wait a few minutes. As the rods heat up, the balls will begin to fall as the clay softens and loses grip. Discuss the different rates of thermal conductivity between the copper, aluminum, and stainless steel rods and why the steel balls fall off one rod before another. NOTE: Only one or two of the balls will fall from the stainless steel balls. Don't wait for them all to drop. Turn off the burner after all the balls have dropped from the copper and aluminum rods.

Thermal Conductivity (W/mK)

• COPPER = 386
• ALUMINUM = 237
• STEEL = 80
• STAINLESS = 16
• TEFLON = 0.25

#### Equipment:

• Bunsen burner
• Insulated Ring Stand
• Modeling Clay
• Steel Ball
• Tripod w/ Copper, Aluminum & Stainless Steel Rods