Break the Bolt, 4A30.30b

Topic and Concept:

• Thermal Properties of Matter, 4A30. ThermalExpansion

Location:

• Cabinet: Thermodynamics (TD)

• Bay: (A1)

• Shelf: #1,2,3..

Abstract:

A heated bar is tightened in a yoke against a cast iron peg which breaks as the bar cools.

Important Setup Notes:

• This demonstration requires a supply of methane gas usually provided by the red and white gas carts found in rooms 2103, 2241, (and 2223 upon request).

• This demonstration requires a supply of liquid nitrogen. The main supply is located at the loading dock. If 12 hours notice given to lecture demo, supply will be provided.

Setup and Procedure:

1. List steps for setup then procedure.
2. ...

Cautions, Warnings, or Safety Concerns:

• Always use the gloves and safety glasses throughout this demonstration.
• Beware of the heated plate - contact with skin could cause severe burns!
• Use care when working with the liquid nitrogen - prolonged contact with skin causes severe frostbite!

Discussion:

Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate.

Videos:

• Lecture Demonstration's Youtube Channel

References:

• Wikipedia - Thermal Expansion

• Wikipedia - Coefficient of Thermal Expansion

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