Description: Two weights connected by piano wire are hung on a bar of ice. The wires cuts through the bar of ice. The ice refreezes, remaining intact when the weights drop to the table top.

Source: UW Card Catalog

Year: N/A Vol: N/A Page: N/A

Keywords: Weights, Piano wire, Ice, Pressure, Melt, Refreeze

Rating:

Hazard: Low

Injury hazard – laceration

Effectiveness: Good

Strong effects are seen by audience
Demo has good connection to course material
Clear contrast between behavior of systems
Time to results is medium
Moderate failure rate

Difficulty: Medium

Careful placement is required
Demos at non-standard conditions
Prior practice recommended

Safety Precautions:

Practice is recommended
Cryogenic gloves are required
Eye protection is required

Class: Liquids and Solids, Solid State Chemistry, Intermolecular Forces, PV Diagram

Division: General, Material Science Chemistry, Physical Chemistry

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