B-B Trays
Description: BB trays are shaken on an overhead projector. Stopping the BBs will produce a close packing arrangement.
Source: Ellis, A. al et. Teaching General Chemistry: A Material Science Companion
Year: 1993 Vol: N/A Page: 100
Keywords: BB tray, BB board, Close packing, Point defects, Slip planes
Rating: 
Hazard: Low
- Simulation
- No use of chemicals
Effectiveness: Average
- Results are observable with guidance
- Good connection from demo to course material
- Mild effects are seen by audience
- Time to results is low
Difficulty: Low
- Procedures are simple
- Manipulations are simple for most to perform
- Prior training recommended
Safety Precautions:
- Use of UL approved three-prong plug and outlet if using overhead projector
- Eye protection recommended
Class: Solid State Chemistry
Division: General, Material Science Chemistry
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